You will know from your high school chemistry class that oil and water are not mixing. Both paints and stains are either oil-based or water-based and can be catastrophic when mixed.

Specifically, water-based paints can not stick to the oil-based product, thereby spilling or peeling. Because water paints are on top of the board, the oil-based products can not penetrate the wood and never set.

Most oil-based paints are designed to sink into wood. Stains and varnishes can be easily detected by examining house surface. If you can see wood grain and stain simply coloring and enhancing wood, it is an oil-based product to use.

However, increasingly non-transparent stains are being used. These stains frequently sink into the wood, but painting appears by covering all aspects of the wall. For this purpose, the transparency check can be used to evaluate transparent oil-based products, but not the only tool of evaluating solid or semi-transparent paints.

Since some oil-based paints have the same characteristics as water-based paints, the Goof Off check should be used before any painting is finished.

Goof Off and similar products remove all kinds of materials, such as oil, latex (water-based) paints. Find mess in your local hardware store. Many brands are available, make sure it says it removes latex paint.

Douse a rag with some goof off and find an unconspicuous place to test your wall. Start brushing the wall with the rag (wear gloves). If the color goes off, it's a water-based paint. If the paint is already peeling, make sure you have signs of the mess breaking down the paint. The paint will bubble or look like melting or wet.

You may want to use latex because it's much easier to work with. Most older houses have oil-based paint, as it was mostly used in the past. If your building is painted with solid oil-based paint, first use the primer. The primer binds to the wall and provides the latex paint surface to fit. Make sure you tell them you're covering a latex paint oil when you go to the paint shop and they'll make sure you get the right primer.
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