To figure out if paint is oil-based, you can do a simple test using rubbing alcohol. First, find a little spot on the paint that's not too noticeable. Dab a bit of rubbing alcohol on a clean rag or cotton swab and gently rub it on the paint. If the paint starts to come off onto the rag or swab, it's likely water-based, because oil-based.. How to Tell if Paint is Oil Based: The Acetone Test. Acetone is not a friend of latex. Acetone essentially dissolves latex on contact. So one way you can find out whether your paint is oil or latex-based is by rubbing a bit of nail polish remover, which is rich in acetone, onto a rag or paper towel and wiping the paint surface with it.

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Look for Old Paint Cans. 2. Test it with Rubbing Alcohol. 3. Buy it at the Paint Store. It is important to know whether your paint is oil-based or latex-based. This applies whether you are painting a surface for the first time or you are painting over old paint. Latex paint will not adhere well to oil-based paint, so if your walls are oil paint.. Advertisement. A simple test can tell whether wall paint is latex or oil. Wash a test patch of the wall in soap and water, then rub an alcohol-soaked cotton swab on the wall. Any paint on the cotton means it's latex, and no paint means it's oil. Latex paint won't adhere to oil-based paint.