Oil based paints, known for their durability and glossy finish, create a non-porous surface that repels moisture and standard latex adhesion. Opting for a paint with mildewcide is also beneficial, especially if the surface is exposed to moisture.
Solving Latex Over Oil-Based Paint Problems: Adhesion and Preparation Tips
Lightly sand the oil based surface with fine grit sandpaper to create a matte texture and key for the latex. Preparation Method Best Used When Level of Durability Light Sanding + Bonding Primer Surface is stable and free of peeling Good Deglossing + Full Re-coating Surface is heavily damaged or porous Excellent.
Latex paint, which uses water as its carrier, contains different solvents that can potentially soften or reactivate the underlying oil layer if the flash off time is insufficient. This ensures that the latex adheres to a stable substrate rather than a potentially unstable film.
Solving Latex Over Oil-Based Paint Problems: Adhesion and Preparation Tips
When applied directly over a smooth, non porous substrate, the latex lacks a secure grip, causing it to act more like a coating sitting on top rather than a layer integrated with the underlying surface. Apply a high quality bonding primer specifically designed for slick surfaces to bridge the old and new paint.
More About Latex over oil based paint
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