Formation of cracks
Description of the defect
Longitudinal cracks along the pores or web-shaped cracks spread over either part or all of the surface.
Cause of the defect
Longitudinal cracks along the pores, mostly cracks in the veneer due to:
- unsuitable veneer, for example multiplex or too much veneer
- veneer insufficiently bonded
- swelling of the veneer/shrink cracks
Web-shaped cracks, mostly cracks in the lacquer due to:
- too much lacquer applied, lacquer system too brittle
- with polyurethane lacquers: hardener forgotten
- lacquer/hardener mixture too old
cracks in the MDF edge
Defect solution
If the cause of cracks forming lies with the coating, sand the lacquer down to the raw wood and recoat with a suitable system, otherwise re-treat the object.