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
8 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.
The reviewed DTM Acrylic sheet lists a separate bonding-primer system for baked-on siding finishes. Its previously painted-surface guidance calls for an adhesion test after a one-week drying period.
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.
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
Filed under Problem: Peeling