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
4 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.
Painting over it does not restore adhesion.
See Choosing the Right Primer for the distinction between stain blocking and bonding.
Manufacturer directionBenjamin Moore describes blocking as painted surfaces sticking when pressed together before the finish has dried and cured sufficiently.
Only after investigating other likely causes should widespread, gradual release at the original coating-to-wood bond be attributed to age-related failure.
Filed under Problem: Peeling