Adhesion problems
Adhesion problems
Insufficient intermediate sanding (microscopic cross section)
Insufficient intermediate sanding (microscopic cross section)
Too much stress in the internal profile (microscopic cross section)
Detachment due to wood moisture/shrink cracks
Description of the defect
The layer of lacquer does not exhibit the required adhesion with the substrate (cross cut test).
Cause of the defect
- defective substrate pre-treatment (fat not removed, not sanded).
- unsuitable substrate (contains paraffin or release agent).
- unsuitable coating system.
- incorrect drying of the coating system.
- base coat insufficiently sanded
- sanded base coat left for too long .
Defect solution
The poorly bonding layer of lacquer needs to be removed completely. Then the surface is pre-treated with a suitable coating in accordance with instructions.