Lightly sanding the latex surface with fine-grit sandpaper creates microscopic scratches for the oil coat to bite into. When checking compatibility, verify that the topcoat is indeed solvent-based.
Achieving Long-Lasting Results When Painting Oil Over Latex Surfaces
For oil paint to adhere to latex, the surface must provide a rough texture and a clean, greasy key. Following this, a thorough cleaning with a degreaser is essential to remove dust and residual oils that could block the bond.
This is typically achieved through a process called deglossing or sanding. If the painted surface feels soft or sticky long after the expected drying time, it is likely due to a process called "intermixing.
Achieving Long-Lasting Results When Painting Oil Over Latex Surfaces
Compatibility with Modern Paints It is important to note that the term "oil-based" is often used loosely in modern retail. To fix this, you must wait for the coat to cure fully, then lightly sand the surface and apply a thin sealing coat of shellac or a stain-blocking primer before repainting.
More About Can you paint oil based paint over latex paint
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