10/15/2026
đź§ NOVALK KNOWS | TECH TALK THURSDAY
đź”— ADHESION IS A SYSTEM, NOT A PRODUCT.
One of the most common mistakes when troubleshooting adhesion problems is assuming the topcoat is responsible simply because it's the layer that's peeling or scratching off.
In reality, adhesion is influenced by everything happening beneath and between the coating layers.
1. Substrate Preparation
Dust, oils, waxes, silicone contamination, and other surface residues can prevent a coating from establishing a reliable bond.
2. Stain & Coating Compatibility
Not every stain is compatible with every clear coat. Slow-drying oil-based stains, residual solvents, and certain additives can interfere with adhesion and proper film formation.
3. Surface Preparation Between Coats
Sanding isn't simply about creating a smooth surface. Proper preparation also helps establish the conditions necessary for reliable intercoat adhesion.
4. Application & Drying Conditions
Excessive film build, low temperatures, high humidity, or insufficient drying time can interfere with film formation and adhesion development.
5. Cure Time
Dry to the touch doesn't mean fully cured. Evaluating adhesion prematurely can produce misleading results, particularly with reactive two-component systems.
Here's the important takeaway:
If a coating performs well over properly prepared raw wood but fails over a stained or previously finished surface, that difference is an important diagnostic clue.
Before changing coatings or increasing catalyst levels, investigate the entire finishing system.
Adhesion isn't determined by one product. It's the result of a properly designed and executed finishing process.