Understanding the Chemistry: Why Oil and Water Don’t Mix The fundamental challenge lies in adhesion. Latex paints, on the other hand, cure through water evaporation, forming a flexible film that relies on bonding to a porous surface.
Latex Over Oil Paint Preparation Tips
Oil and latex have different drying times and viscosities, so working in small sections is essential to prevent lap marks. Applying a fresh coat of color over an existing finish seems straightforward, but the chemical reality of the materials dictates strict rules.
The old surface must be rendered porous enough to accept the new layer. The result is peeling and cracking, where the new paint simply slides off the old one.
Essential Preparation for Latex Over Oil Paint Surfaces
Before applying latex, you must inspect the substrate and fill any cracks or holes with a flexible, oil-compatible filler. This involves a combination of mechanical and chemical actions to break the glaze of the oil finish.
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