can the products be applied during rainy season?

  • Every product has its own drying time. And its quite risky to paint during the rainy season. If you go ahead with the painting and it rains heavily, not allowing enough time for the paint to dry, you might have to face problems. Hence, we recommend you to observe the weather condition and then go ahead with painting.

how long should one wait before painting in case of a new construction?

  • You need to allow a curing period of 45 days for exteriors, and 3-6 months for interiors.

what does curing period mean? why should one follow this process?

  • Curing period means the walls should be left bare. This is because the paint should not react with the chemical present in the cement.

can ink or other stains be washed off?

  • Most wall paints made by Asian Paints are washable, compared to other brands. Common stains, like pencil marks, can be easily cleaned. But, it is difficult to clean tough stains. You may try using a mild detergent to clean the stains.

how are the stains on the floor removed after the painting is over?

  • Any paint stains should be wiped off immediately. Use a mop and clean up each room after the painting is over. Enamel paint stains require thinner for cleaning. You can also use turpentine to scrub them off the floor.

what is the expiry date of the paints?

  • If you haven't opened the lid of the product, it will last for next 3 years from the date of manufacture of the Paint. If you have opened the lid of product, we recommend you use the product within the next 24 hours.

what is acrylic?

  • Acrylic basically means water based products, which have High Density Particles that result in an excellent finish on your walls.

what are emulsions?

  • Emulsions are acrylic based paints, which are water based. These are available for Interior Wall surfaces as well as Exterior Wall surfaces.

what is the difference between regular and premium emulsions?

  • All emulsion paints give a smooth finish and soft feel to the wall. They come in lovely shades and are long lasting. Premium Paints have additional properties such as better washability, stain resistance, longer life. Some premium category paints can also provide specific properties like water beading, etc.

what is the difference between solvent-based and water-based paints?

  • Water-based paints are diluted with water, while solvent-based paints are diluted with solvents like Mineral Turpentine Oil (MTO). Emulsions are water-based paints while enamels are solvent-based paints. Emulsions look better on walls and are ideal for drawing rooms. Solvent-based paints are ideally suited for kitchens and bathrooms since they are water-resistant. Enamels are used on wood and Metals.

what are primers and putty?

  • Primers and putties are applied on the paintable surface before the final paint is applied. Before you apply putty or primer you have to sand the wall with sandpaper. Putty is a kind of paste prepared for applying on walls to fill in any minor dents or to level the surface. Since putty is absorbent, a coat of paint applied directly over it would lead to the paint being absorbed unevenly, leading to patches. A primer layer on top of the putty is a must. It takes away the unevenness caused by putty and the final paint comes out perfect. Thus, you get both protection and good finish.

what is the role of primer paint?

  • Primer paint is a preliminary layer of coating that is applied on the materials prior to the paint. It ensures that the paint adhesion to the surface is proper, enhances the durability of paint, and imparts extra safety to the surface being painted. Primer also seals pores in permeable materials, and averts bleeding from knots. If suitably applied, primers will enhance the life of the paint, and also improve its appearance.

what is the pre-painting procedure for interiors?

  • The pre-painting procedure for Interiors includes the following steps: 1) Check surface for dampness or water seepage. 2) Rectify the water seepage problem at the source. This could mean repairing leaking plumbing or cracks in the exterior walls. 3) Any loose plaster should be removed from the wall. Check for loose plaster by tapping on the walls. Any hollow sound means the plaster is loose. 4) Masonry work to be undertaken to fill up all cracks and repair broken plaster.

what should be taken care of while painting?

  • While Painting you need to keep in mind some Tips: 1) To save on costs, buy paint in the largest pack possible. 2) Stir and strain the paint thoroughly before application. 3) Rectify existing surface problems like cracks/seepage, etc before the actual painting process. 4) Ensure that the paint is bought from an authorized dealer. 5) Ensure that the shop has an additional quantity of paint in case you need it later (of course, at our dealers especially Colour World, you will not find this problem.) 6) If you are using thinners, primers and undercoats, ensure that they are of good quality. 7) Always clean spilt/splashed paint with a recommended thinner while it is still wet.

what precautions should be taken while painting?

  • While painting, one must take a few precautions, such as: 1) Do not use cotton rags for cleaning, use soft synthetic or muslin cloth.  Otherwise, threads will stick to the surface leading to a patchy, uneven finish. 2) Do not apply the next coat without the first one drying, otherwise you will have a wrinkly, patchy finish as well as loss of gloss. 3) Do not sandpaper very hard, otherwise there will be scratches, roughness and poor gloss. 4) Do not apply very thick coats, otherwise there will be a thick rough finish, resulting in slow drying. 5) Avoid mixing paints yourself. Buy readymade paints as far as possible, otherwise there will be patchy and inconsistent columns in the finish.

what happens if a thick layer of putty is applied?

  • If a thick layer of putty is applied there is a possibility of cracks developing after a period of time.

can paint be applied directly on putty?

  • We recommend you do not apply finished paint directly over putty, otherwise you will get a uneven finish. Always apply a coat of primer over putty and then the final coat.

are asian paints products lead free?

  • Yes, all our products have no added lead.

how different are paints from lime wash?

  • Lime wash is a very low substitute for paint. It has a poor finish, is neither washable nor durable. Also there is no choice of colour. Lime wash rubs off on hands, clothes etc from the walls easily.

does asian paints make only wall paints?

  • Apart from wall paints, we offer paints for wood, metals and paints for automobiles. There is a huge variety of colours to choose from.

are all paints washable?

  • Tractor Emulsion, Value Super Emulsion, Apex Emulsion and all the enamel paints from Asian Paints are completely washable. They give a good finish to walls and can very easily clean any dirt or stains.

do paints need to be mixed to get a good colour?

  • It is not a good idea to mix paints to get a particular shade. You will not get exactly the same shade from wall to wall, and the finish will be patchy and irregular.  So, it is always better to use available shades. They are standard across all packs and never vary. Asian Paints offers you a wide range of shades to choose from.

how can the walls be maintained in a good condition? how should one keep the painted walls clean?

  • You can dust your walls from time to time. Remove stains with a sponge and mild soap while it is still wet. Take care not to press too hard while cleaning.

how quickly does the paint dry?

  • Duration of painting depends on the number of rooms you plan to paint and how many painters are working. Paint drying time for Emulsion is 4 hours minimum, though 6 to 8 hours is preferred. Enamel, Primer requires 8 to 10 hours.

how can walls be protected from insects?

  • Paints do not attract insects. Kitchens can have insects due to the presence of food. Since most paints are washable, it is easy to keep the walls clean. However it is advisable to opt for regular pest control in your house.

should a newly painted house be vacated for some time?

  • Your house will smell a little but it is not necessary to vacate it. Keep the windows open and the smell will disappear faster.

how many coats of paint should be applied?

  • Depending on the condition of the walls and the colour of previous paint, 2 to 3 coats should be applied.

how many years does the paint last for?

  • Good paints applied with the correct number of coats generally last for 5 to 6 years.

how long does a painting project take?

  • The duration of painting depends on the number of rooms you plan to paint, and how many painters are working. The Interior walls take approximately 10 to 15 days, and the Exteriors usually takes approximately 15 days.

is there any paint which provides a cooling effect?

  • We are sorry to inform you that we do not have paints which provide a cooling effect.

what is the curing period for newly constructed exterior surface?

  • The curing period for a newly constructed exterior surface is 30 days from the day of plastering done (depending on exposure and weather conditions).

what is the curing period for newly constructed interior surface?

  • The curing period for a newly constructed exterior surface is 3 to 6 months from the day of plastering done (depending on exposure and weather conditions).

what is the curing period for re-plastered wall surface?

  • The curing period for re-plastered wall surface is 7-14 days (for plaster thickness upto 7-10 milimetre).

how does one check whether curing is done properly or not?

  • Use PH paper (Range 8-14). PH of the plastered wall should be less than 12.

do you have any specific paint that act as a heat shield to be applied on the terrace of a house?

  • No, we don't manufacture any such product.

a research scholar wants to know the paint composition. can the same be shared? they can provide valuable information such as heat release rate, mass loss rate, flame temperatures etc.

  • Paint composition for any product is confidential thing. We regret to inform you that the same cannot be shared with anyone. However, basic paint ingredients can be found on google.

I want to paint a wall white. however, the colour should be such that if I write on it with marker pens, I should be immediately able to erase the same with cloth (similar to a board). do you have any such paint?

  • We're sorry, but we don't manufacture any such product.

I want to paint a wall white. however, the colour should be such that I should be able to stick a post-it note/paper and upon removal the paint should not come out. do you have any such paint?

  • We're sorry, but we don't manufacture any such product.

is there any specific exterior paint for painting a brick wall to be used as screen for a projector?

  • We don't manufacture any paint that can be used as Projector Screen.

is the painting procedure that is mentioned on the website applicable for a newly constructed house already applied with white cement?

  • For newly constructed wall - Alkalinity level of wall needs to be checked with PH paper before painting. The PH level should be less than 12. If the PH level is high, then further curing is required. Follow the recommended painting process as mentioned on the website.

can asian paints products be purchased online via website and will they be delivered at home?

  • There is no option of online payment currently. Also, we do not deliver paints directly as of now. It is retailed via our dealer network only.

1. what is the difference between - kerosene oil, tarpin oil, white/mineral spirit & mineral turpentine. 2. uses of above in painting application?

  • Kerosene is composed of saturated aliphatic hydrocarbon. It has low or no aromatic components. Its boiling range is around 150 - 300 degree Celsius. Mineral Turpentine Oil has up to 40% aromatic constituents, which gives Mineral Turpentine Oil good solvent power and the distillation range is 150 to 240 degree Celsius. White spirit is a petroleum-derived clear, transparent liquid. Its boiling point is 65 degree Celsius. All the above solvents are used to cut the viscosity of the solvent based paints. But the solvents are recommended based on the product and thinner compatibility. If the wrong thinner is used, it may lead to issue of poor hardness, less gloss and less durability.

how often should one get their house repainted?

  • The decision to repaint a house typically depends on factors such as climatic conditions around the structure, type of paint to be used, previous paint condition,the kind of upkeep required etc. Given the climatic conditions in Indonesia, it is recommended to paint one's house after every 5-6 years with a good quality paint. This is applicable to both, interior & exterior painting work.

how do I remove apex stains from clothes?

  • There is no specific chemical available to remove Apex stains from cloth. You may try regular detergent (soaked for overnight) and then try and remove by wirebrush.

how accurate is the paint budget calculation on the asian paint website? how much can one rely upon this budget calculation?

  • The budget provided by Paint Budget Calculator is just an estimation of costs and there would be variations in the +/-20% range depending on city, location etc

the builder of my house has done the pop (plaster of paris) and he has applied low quality paint on the walls. now if I have to re-paint my house then is it required to use pop (plaster of paris) again?

  • In case the condition of the old paint is good i.e. no signs of chalking (dusting), flaking etc then do sanding with a 80/120 no. sand paper and follow the recommeded painting procedure. No need to reapply POP (Plaster of Paris).

i am creating home products for which i need to use enamel paints. however the lead content in enamel based paints has been a concern for me and how to market them from a health and safety perspective. please do advise on lead content in your paints.

  • None of our products including enamels contain any ‘added lead’. There might be some lead particles either in the raw material used or created during formation of enamel and thus it will not be completely lead free. However there is no added lead in our enamel paints. There is no measure of how much lead is present in enamels.

please advise on the cleaning instructions for asian tractor emulsion and apex.

  • Cleaning Instructions: 1) For TE – Take a mild soap solution (5% in water) or Liquid soap/detergent powder and wipe the walls using a household sponge. Wipe the entire wall to avoid any patches. 2) For APEX – Clean the exterior wall using only water. Do not use jet pressure while cleaning or you might damage the paint.

I have a newly constructed flat. is it appropriate to paint the interiors during the monsoons?

  • Since the construction is new, it is necessary to check the alkalinity of the plastered surface. The same can be checked using ph paper (available in the market). If the alkalinity is high i.e. more than 12 then do not paint, wait for some time. If alkalinity is between 8-11, then painting can begin using the recommended painting system (check on Asian Paints website). Ensure there is no leakage/seepage, cracks on the walls or will affect the paint during or after monsoon.

what is the difference between emulsion and enamel?

  • Emulsion paint is water based with some additives to make it more durable, but can usually be scrubbed off with water and detergent. Enamel paint is solvent based, and permanent. It can only be removed with a solvent. Use emulsion to cover large surfaces cheaply and where you may want to change the colour - use enamel paint (which is much more expensive).

what are the main reasons for failure of paint after application on surface?

  • The main reasons of paint failure after application on surface are the applicator and improper treatment of surface.

what is the relationship between dry film thickness (dft) and wet film thickness (wft)?

  • The relationship between dry and wet film thickness depends on the volume of solids in the coating. Solids by volume is normally given as a percentage of the total volume of tha paint. DFT = WFT X solids by volume e.g. If Wet Film Thickness is 100 microns and solids by volume is 75% (0.75), Dry Film Thickness comes to be 75 microns.

on what factors does wet film thickness depend?

  • The applied wet film thickness depends on many variables such as the type of coating, application method (air pray, brush, roller, airless spray, electrostatic, tribo gun, etc.), equipment quality, operator, substrate material, the size and shape of the part etc. Incorrect coating thickness could lead to technical problems or excessive costs.

what problems can a very low dry film thickness lead to?

  • Extremely low dry film thickness can lead to: 1) Insufficient corrosion protection 2) Hiding power problems 3) Erosion - removal of paint film from selected areas 4) Grinning - underlying surface is visible 5) Rust Spotting 6) Undercutting - visual corrosion beneath the film

what problems can very high dry film thickness lead to?

  • Extremely high film thickness causes problems like: 1) Extra material costs 2) Sagging (Sags), Runs - downward movement of paint soon after application 3) Alligatoring - very large cracking 4) Cracking 5) Mud Cracking - paint appears as dried-out mud flat with network of random cracks 6) Tackiness - stickiness in film

what is the role of primer in paint?

  • Primer paint is the preliminary layer of coating that is applied on the materials prior to painting. It ensures that the paint adhesion to the surface is proper, enhances the durability of paint, and imparts extra safety to the surface being painted. Primer also seals pores in permeable materials, and averts bleeding from knots. If suitably applied, primers will enhance the life of the paint, and also improve the appearance.

why are darker shades are more expensive?

  • Dark shades are more expensive due to the pigment's (mostly organicin) which are added to colour the base and get the required shade. Darker shades mean more quantity of pigments.

what is the stability of thinned paint?

  • It should be used within 24 hrs.

what is the expiry date of asian paints products?

  • If you haven't opened the lid of our product, it will last for 3 years from the date of manufacturing. However, if you have opened the lid of the product tin, then we recommend you use the product within the next 24 hours.

does asian paints provide a material test certificate?

  • Yes, we do provide one. However, we require certain details from you i.e.: 1) Product Name. 2) Shade Name. 3) Shade Code. 4) Base Name. 5) Base Code. 6) Batch No. 7) Quantity. 8) Manufacturing Date. 9) Where it is used (Surface)? 10) What are usage & application conditions, and specification if any. 11) Project for which it is required. 12) Interior or Exterior Exterior surface. You need to email all the above information, at customercare@asianpaints.com and we will revert to you in the next 24 hours.

what are the main reasons for failure of paint after application on surface?

  • The main reasons of paint failure after application on surface are a poor applicator or improper treatment of the surface.

what is the dilution defect?

  • Dilution defect usually occurs when the dilution of the paint is not done as per manufacturers recommendation. There can be a case of over dilution and under dilution, as well as dilution with the incorrect solvent.

what is blistering?

  • Blistering is a defect caused by trapped moisture or gases in paint film (more likely in enamels). It is nothing but bubbles like appearance on paint film.

what are the causes of blistering?

  • Blistering could be due to any of the below reasons: 1) Dampness in the wall due to leakage or seepage. 2) Thick deposition of paint or Putty, Plaster/POP is highly absorptive in nature (Uncured) 3) Applying Emulsion paint over distemper.

how does one prevent blistering?

  • Prevent blistering with the following steps: 1) Wall should be free from dampness (Waterproof the affected area). 2) Apply paint/putty in thin layers only. 3) Allow Plaster/POP to cure properly. 4) Remove distemper completely before applying emulsion paint.

how can I repair blistering?

  • You can repair blistering by smooth sanding the surface, and then repainting it.

what is adhesion failure?

  • Adhesion failure is when a paint fails to adhere to substrate or underlying coats of paint.

what are the causes of adhesion failure?

  • The causes for adhesion failures are as follows: 1) Application of paint over oily, greasy or very smooth surface. 2) Application over loose particles like dust or rust. 3) Not sanding previous coat of gloss paint. 4) Application over partially dried coat.

how does one prevent adhesion failure?

  • Prevent adhesion failure by: 1) Ensuring proper surface preparation. 2) Using the correct coating specification and follow the advised over coating times.

how can I repair adhesion failure?

  • Repairing adhesion failure depends upon the extent of adhesion failure. Removal of defective areas will be necessary prior to adequate preparation and application of correct coating system to manufacturer’s recommendations.

what is bleeding or 'bleed through'?

  • Bleeding is defect of undercoat staining through the topcoat.

what are the causes of bleeding?

  • Bleed through is generally a full or partial. Redissolving of the previous coat or an ingredient of a previous coat and can occur when strong solvents are used in the topcoats.

how should I prevent bleeding?

  • Prevent bleeding by: 1) Using correct coating specification and materials. 2) Using compatible materials. 3) Using appropriate sealer coat if possible.

how can I repair bleeding?

  • You can repair bleeding by: 1) Removing stained or contaminated layers. 2) Applying a suitable sealer coat which will prevent the diffusion of soluble coloured material from beneath. It may be possible to apply a sealer coat without the removal of the stained/contaminated layer.

what is blooming or blushing?

  • Blooming or blushing is a hazy deposit on the surface of the paint film resembling the bloom on a grape, resulting in a loss of gloss and a dulling of colour.

what are the causes of 'bloom or blush'?

  • Bloom or blush are caused when paint film is exposed to condensation or moisture during curing especially at low temperature (common phenomenon with amine cured epoxies). Incorrect solvent blend can also contribute to blooming.

how can I prevent blooming?

  • Prevent blooming by applying and curing coating systems under correct environmental conditions, and follow the manufacturer’s recommendations.

how does one repair blooming?

  • Remove bloom with clean cloth or suitable solvent cleaners. If necessary, apply undercoat/topcoat following manufacturer’s recommendations.

what are brush marks?

  • Brush marks is a defect where marks of brush remain in the dried paint film. Pronounced brush marks are known as ropiness.

what are the causes of brush marks?

  • Brush marks are caused by: 1) Viscosity of material may be too high for brush application. 2) Incorrect thinners used. 3) Inadequate mixing or poor application technique. 4) Paint has poor leveling properties. 5) Two-pack paints may have exceeded application pot-life.

how can we prevent brush marks?

  • Prevent brush marks by: 1) Using brushing grade of paint and apply adequate thickness. 2) Thinning paint to brushing viscosity. 3) Using within pot-life. 4) Using proper brushes.

how does one repair brush marks?

  • You can repair brush marks by: 1) Sanding the surface to a smooth finish, and applying paint (after thinning to desired proportion). 2) Use good quality brushes.

what is bubbles or bubbling?

  • Bubbles within a paint film appear as small blisters. These may be intact or broken (to leave a crater). Bubbling can be found in excessively thick paint films, especially if spray applied, and also with roller application. This should not be confused with blistering.

what are the causes of bubbles or bubbling?

  • The causes of bubbles or bubbling are: 1) Trapped air/solvent within the coating which is not released before the surface dries. 2) Air entrainment during mixing. 3) High ambient temperature during application. 4) Factory applied coatings where application is by dipping, electrodeposition or roller coating.

how does one prevent bubbles or bubbling?

  • Prevent bubbles or bubbling by: 1) Adjusting viscosity with thinners and following data sheet requirements for maximum application temperature through spray application. 2) Using correct mixing equipment to ensure air is not stirred in during mixing. 3) Applying a mist coat. 4) Adding a defoaming agent to emulsion paints.

how can we repair bubbles or bubbling?

  • You can repair bubbles or bubbling depending on extent and severity of bubbling, sanding or removing the offending coat(s) and recoating.

what is chalking?

  • Chalking is a friable, powdery layer on the surface of a paint film. A change of colour or fading is also seen. Chalking rates vary with pigment concentration and choice of binder. Chalking is a known characteristic of certain paints e.g. epoxy paints.

what are the causes of chalking?

  • Chalking is caused by the disintegration of the paint binder on exposure to weathering and/or UV light.

how does one repair chalking?

  • You can repair chalking by removing all powdery deposits by wiping, scrubbing, high pressure washing or sanding. Wipe loose material off and apply a chalk resistant topcoat.

what is cracking?

  • Cracking is the splitting of a dry paint film through at least one coat to form visible cracks which may penetrate down to the substrate. Cracking comes in several forms, from minute cracking to severe cracking.

what are the causes of cracking?

  • Cracking is cause by generally a stress related failure and can be attributed to surface movement, ageing, absorption and desorption of moisture and general lack of flexibility of the coating. The thicker the paint film, the greater the possibility it will crack.

how can I prevent cracking?

  • Prevent cracking by using the correct coating systems, application techniques and dry film thicknesses. Alternatively, use a more flexible coating system.

how does one repair cracking?

  • You can repair cracking by using sand paper to remove all cracked paint. Correctly reapply the coating system, or use a more flexible system and one less prone to cracking.

what is efflorescence?

  • Efflorescence is a white (powdery) substance on the substrate of concrete, brick, masonry and plaster. The efflorescence, which comes from the migration of salts, can lift the paint from the substrate.

what are the causes of efflorescence?

  • Efflorescence is caused by soluble salts within the substrate. Moisture brings the salts to the surface of the substrate resulting in coating adhesion failure.

how can one prevent efflorescence?

  • Prevent efflorescence by ensuring the surface is moisture free, clean and suitable for application of the coating system. Remove or eliminate the source of moisture.

what is peeling?

  • Peeling is similar to flaking, although peeling tends to be associated with the soft and pliable fresh coatings, which can be pulled away from or spontaneously flake away from the substrate or from between coats, due to loss of adhesion.

what are the causes of peeling?

  • Peeling is the reduction in bond strength of the paint film due to contamination or incompatibility of coats.

how does one prevent peeling?

  • Prevent peeling by using the correct coating system, and specification applied to clean and uncontaminated surfaces.

how does one repair peeling?

  • You can repair peeling by removing all soft and pliable coating back to a firm edge, or a total removal. You must sand, clean and apply suitable coating system, as per the recommended procedure.

what is tackiness?

  • Tackiness is a degree of stickiness remaining in the film. Although beyond the wet and liquid stage, the paint film remains as a tacky and soft surface, and is sometimes only apparent on touching the coating.

what are the causes of tackiness?

  • There are various reasons why a paint will remain tacky: 1) Over thickness 2) Excessive thinners; 3) Wrong (lack of) curing agent; 4) Low drying/curing temperature; 5) Use of coating beyond pot life or shelf life.

how does one prevent tackiness?

  • You can prevent tackiness by: 1) Using the correct coating specifications and materials. 2) Ensuring two-pack materials are correctly mixed. 3) Following paint suppliers recommendations.

how does one repair tackiness?

  • To repair tackiness, you must remove defective coating by sanding, then clean it and recoat.

in a newly constructed house, wall putty is completed. can the customer apply primer on the interiors, and then paint after 2 months?

  • It is not advisable to apply Primer, and leave it for a long period of time (not more than 10-12 days). If it is applied and kept for a long time, then it will form a powder and lead into loss of adhesion to paint the film. Therefore, it is recommended to cover the primer with Top Coat within the shortest possible time i.e after drying of primer. In case wherein putty is applied earlier, one can apply Primer and 1 coat of Finished Paint and wait for 2 months. Post that, light sanding and finish paint (2-3 coats) can be applied.

a local contractor did not remove the earlier paint, i.e., the local cement paint on the walls, and he did not remove the dust accumulated on the walls of the house. He painted over it with asian paints apex. can the two factors affect affect the life of the paint?

  • Ideally, the old paint is to be scraped off, and then a coat of Exterior primer is to be applied before application of Apex. If Primer is not applied, and the earlier paint was a cement paint, chances are paint peeling off are on a higher side.

can sprayers be used instead of rollers for a fast and uniform finish?

  • Yes, spraying instead of rolling will definitely give a better finish. However, mist formation in air and skill required to spray the paint is very critical. One needs to take care of covering/masking, choosing right spraying equipment and skilled applicator for achieving the right finish.

what are the instructions or methods for safe disposal of used paint containers?

  • We don't have any process to dispose the used container. Typically, it is given to the plastic garbage collector, who in turn sells it to a plastic recycle agency.

how should I calculate the quantity of paint required if paint coverage and total surface area of the room is known?

  • You can calculate the quantity of paint required with the following: Total litres of paint required = total surface area (in square feet) X number of coats / coverage of paint (square feet per litre).