Skipping this step almost guarantees failure, regardless of how well you sanded. Applying a fresh coat of color over an existing finish seems straightforward, but the specific combination of materials dictates success.
Latex Paint on Oil Base Trim: Preparation and Application Tips
You need to physically roughen this surface to allow the latex to key into it. A high-gloss or semi-gloss oil finish provides very little surface area for the new paint to grip.
While a standard interior acrylic might work on a well-prepared wall, opting for a higher-performance product can save you time and effort. Oil-based paints cure through an oxidation process, creating a hard, non-porous, and glossy finish that repels water.
Latex Paint on Oil Base Trim: Preparation and Application Tips
Application Techniques for Success. 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.
More About Can you put latex paint over oil based paint
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