Adhesion
How well a coating holds to the surface beneath it, whether that surface is bare material, a repair, or an existing coating.
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How well a coating holds to the surface beneath it, whether that surface is bare material, a repair, or an existing coating.
Problem
Technique
5 entries for “Adhesion”
Field practiceIf adhesion fails, remove the failed test coating, investigate preparation, and return to a sound surface. Test a suitable bonding primer.
Field practiceWhere sound coating remains, the primer must adhere to that coating.
Situation: Glossy doors, trim, baseboards, crown molding, and other difficult finishes · My usual approach: Clean and sand as appropriate, then use a specialty bonding primer when needed. · Selection checkpoint: Verify adhesion; do not assume bonding ability includes stain blocking.
Look for stains, checking, peeling, and physical damage. Identify dirt, debris, or contamination that must be removed. Material between the surface and the next coating can interfere with adhesion and contribute to later peeling.
New paint cannot restore the bond of a detached old layer.
For primer selection and the distinction between sealing damage, blocking stains, and gaining adhesion, see Choosing the Right Primer.
If inspection finds peeling, loss of adhesion, water damage, or another failing condition, address that problem before applying these corrective coats.
Filed under Problem: Drywall dust contamination