Definition- The property that causes one material (wood coatings, stains) to attach to wood, stain, itself, or another coating.
Causes of Adhesion Failure- Contamination of wood or previous finish coat(s).
- Incompatible products used together.
- Improper preparation of wood or finish.
- Over catalyzed product.
- Did not/poorly wipe pigmented stain.
Prevention of Adhesion Failure- Clean the contaminated wood or previous finish coats(s).
- Always use compatible products.
- Prepare bare wood by white-sanding and finished wood by sanding in between finish coats.
- Catalyze at the correct ratio.
- Wipe all "wipe" stains well.
Possible Fixes for Adhesion Failure- Strip and refinish.
- Sanding to remove the failing coating and reapply.
Questions to Ask- Has the product been altered in any way?
Thinners, retarders, colorants, additives, any other additional adds to the product? - Were there any products (water based, oil based, glazes, stains) used that may have left residual material behind?
- What are the environmental conditions, both during application and cure?
- Have things changed, including equipment and personnel?
- Are the products being used compatible?
- Are the products being used from the same manufacturer?
- Was there any preliminary testing of this system before it was used on a larger scale?
- When in the finish process did you notice the problem?
- Has this problem happened before?
If so, what were the conditions at that time, especially compared to the current conditions? - If this is a recoat job, were any polishes, wax, or other treatments used prior to refinishing?
If so, was the piece sanded before being recoated?
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