Skipping this step almost guarantees failure, regardless of how well you sanded. This is done through sanding, but not with a random swipe of grit.
Achieving Strong Latex Bond to Oil Surfaces Through Proper Preparation
After sanding, the surface must be meticulously cleaned. Understanding the Chemistry The fundamental reason this project requires careful attention lies in the chemical properties of the two paints.
Look for paints labeled as "alkyd-modified acrylic" or "formulated for cabinets and trim. A high-gloss or semi-gloss oil finish provides very little surface area for the new paint to grip.
Achieving Strong Latex Bond to Oil Surfaces Through Proper Preparation
Preparation Step Purpose Recommended Action Cleaning Remove grease and dust TSP or mild detergent solution Sanding Degloss and roughen surface 220-grit sandpaper, wipe with tack cloth Priming Bond oil to latex Apply a bonding or stain-blocking primer Choosing the Right Latex Product Not all latex paints are created equal when it comes to covering difficult surfaces. Because oil and water do not mix, applying latex directly over a slick, fully cured oil surface creates a barrier where the two layers essentially slide past one another rather than bonding.
More About Can you put latex paint over oil based paint
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