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Wash a small area with a solution of houshold detergent and warm water. Rinse well and dry it, then soak a soft rag in alcohol and rub it back and forth over the area. If paint comes off, it's latex paint and you can use another coat of latex paint. If the paint doesn't come off, it's oil-based, an oil-based primer is a must

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14y ago
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15y ago

to see if you have oil or water based paint take a cloth and apply alcohol to rag and gently rub in a circle if paint comes off it's a water base if not it's oil

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14y ago

Try rubbing it with denatured alcohol. It will soften or dissolve latex, but won't affect oil.

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11y ago

By testing it with denatured alcohol. If the paint comes off on a rag soaked with the alcohol, then it is water based, If not, oil.

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Q: How do you test paint on the wall to find out if it is latex or oil?
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