Oil-based coatings create a hard, non-porous finish that repels water, making it difficult for the water-based latex to bond securely. This involves using a degreaser or a dedicated adhesion promoter specifically designed to rough up the slick surface and create a mechanical key for the new paint to adhere to.
Latex Paint Over Oil: A Homeowner's Guide to Proper Preparation and Adhesion
You require a shellac-based primer or a high-adhesion bonding primer. This mismatch can create stress within the layers, causing cracks to appear as the underlying film moves.
Multiple coats of a quality primer will reduce the number of topcoats needed, saving time and material costs in the long run. The expansion and contraction rates of the two materials also differ; oil is more flexible and resistant to temperature shifts, while latex can be more rigid.
Latex Paint Over Oil: Essential Prep Steps for Homeowners
Many homeowners and DIY enthusiasts assume that simply cleaning the surface is enough, yet the chemical and physical properties of oil and latex are fundamentally different. They act as a neutral intermediary, preventing the oils from bleeding through and ensuring the topcoat remains vibrant.
More About Latex paint over oil based paint
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