Up until recent years, painting latex over oil was taboo since it had no adhesion properties designed to make it stick to oil surfaces, which meant that you could literally take it off using a fingernail or even just attempting to wash the wall.
If you must use latex over oil, buy 100% acrylic latex and if the walls are glossy at all, you are best advised to sand them prior to applying the acrylic paint. Sanding the walls will improve adhesion, which is the only sticking point to consider when applying latex over oil.
While this is a good way to improve adhesion of latex paint to an oil based paint, the best method to eliminate problems related to adhesion all together is to first apply one coat of latex 'conversion' primer paint prior to applying your finish coat of paint. This will create a strong 'binding' or 'tie' coat of paint to allow your latex finish paint to adhere without further concerns and without having to sand any walls.
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DWC Resizable Drywall Repair Plugs
Painting Mistake #3
Trying to cover an oil based paint with latex paint
This is a mistake which many painters have had nightmares over because once latex paint has dried over an oil-based paint, the only way to get it off is to sand/scrape it off. Painting with an oil based paint over latex is OK but doing the reverse will cause you grief for many years to come since any further coats of paints applied will stick to the latex only.
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5 Painting Mistakes:
Not Covering Furniture - Buying Bargain Paint - Latex Over an Oil Based - Masking & Taping - Buying More Paint
Helpful Things To Know:
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