Field Test for Water-Based or Oil-Based Paint

1. In an inconspicuous area, clean the paint surface with a general purpose cleaner. Let dry or wipe dry.

2. Next, rub the clean surface using a clean rag. Dampen with denatured alcohol. If you see paint residue on the rag, it is most likely water-based paint.

3. After rubbing the area with denatured alcohol, feel the surface. If the surface is smooth and there is no paint residue, the paint is oil-based. If it is slightly tacky and has paint residue, then the paint is water-based.

Note that latex paints are made from a water-soluble base. Enamel paints are made from an oil base. For exterior house paints, both enamel and latex paints are commonly used.