The result is peeling and cracking, where the new paint simply slides off the old one. Roll the paint on in a consistent "W" pattern to ensure the new layer mechanically locks into the pores created during sanding.
Mechanical Chemical Action Oil Preparation for Strong Bonding
The Role of Bonding Primer While preparation is vital, the application of a bonding primer is the insurance policy that guarantees success. Latex paint dries to the touch quickly, but applying a second coat too soon can trap solvents that prevent proper bonding with the oil layer beneath.
Always follow the manufacturer's recommended recoat window, which is usually longer for primers applied over oil substrates. Before applying latex, you must inspect the substrate and fill any cracks or holes with a flexible, oil-compatible filler.
Mechanical Chemical Action Oil Preparation for Strong Bonding
You cannot simply roll over a glossy oil trim without significant abrasion. Sand these repairs flush to ensure a uniform bond for the new topcoat.
More About Can you paint with latex over oil based paint
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