First calculate the actual square feet of space that will be coated. Then you will need to determine how many square feet a gallon of the intended product to be used will cover. Then it is just a matter of dividing the number of square feet to be covered by the number of square feet that a given product can cover. For example, if the product covers 400 square feet, and you are coating 1,000 square feet (1,000 divided by 400 = 2.5), you will need 2.5 gallons.400 square feet is theoretical because the texture of the substrate along with the material left on the applicator and other tools are not part of this calculation. This information is often available on the data page for the product as well.
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Frequently Questions
Maintenance cleaning is vital to the overall service life of a painted surface. However, when selecting a cleaner, be sure to use a non-abrasive cleaner. If cleaning a waterborne paint, avoid products that are ammoniated. Mild, soapy water will generally suffice. However, always test the cleaning solution in an inconspicuous area to ensure that it does not damage the paint film.
A common problem with existing textured paint is that it can be water-soluble. If you use a waterborne product directly over such a surface, it may cause the existing texture to begin to soften and fall off of the surface. Test a fast-drying alkyd primer on the surface. Alkyds have the best chance of not wetting the texture paint. If the alkyd primer does not prevent the softening of the texture, then you may have to consider complete removal of the existing texture and reapplication of a new coat.Application of a fresh coat by roller may be easiest for most; however, in some cases it may not be possible to roll over texture paint as this, too, could cause it to come off. In such cases, application via airless spray may need to be considered. Test the application method over a small area prior to painting the entire ceiling.
