Because oil creates a non-porous, slick surface, latex struggles to bond to it without the proper preparation. Because latex is flexible, it can handle the slight expansion and contraction of the substrate better than a rigid oil finish, potentially reducing the risk of cracking in the future.
Painting Over an Oil Finish With Latex: Proper Prep and Techniques
Success requires a specific preparation process and the correct materials to ensure the new layer adheres properly and lasts for years. Applying a fresh coat of color over an existing finish is one of the most common questions that arises during a painting project.
The most effective method is to lightly sand the surface. Oil-based paints dry through an oxidation process, where the oils harden over time to form a tough, flexible, and moisture-resistant barrier.
Painting Over an Oil Finish With Latex: Preparation and Bonding Tips
This mechanical action scratches the glossy finish, creating a texture that allows the new latex to grip. When to Consider Alternatives.
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