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Latex paint seldom needs thinning and is generally ready to use as is for maximum coverage over other paints. If it does become necessary to thin latex paint, water is the most commonly used, and cheapest, method--but it isn't always the best choice. Occasionally, due to evaporation of water from the paint in extremely hot and dry conditions, it may be necessary to add water to maintain the proper consistency. Thinners designed to be used with latex paint are also available, including such products are Floetrol, Thin-X Latex Thinner and Acriflow. Add any one of these thinners to help reduce brush marks and smooth the finished surface. These products contain additives to break up the surface tension of the paint and help it flow better to eliminate brush marks. Two household products can also be used to thin latex paint. These are the cheap, blue washer fluid for your car and dishwashing liquid. As these products contain detergent, which acts as a surfactant to lessen surface tension, they also help the paint to flow out better.
Use any thinner, even water, sparingly. Using too much will reduce the paint's ability to cover another paint color. It will also increase drying time. Start slowly, adding a small quantity at a time until the paint is thinned properly for your method of application.
To use the dishwashing liquid, mix 2 or 3 drops of the liquid with 1 quart of water then use that, adding a little at a time, to thin the latex paint.
