Blistering
Trapped air
Bubbles in the pores
Micro-foam on the surface
Description of the defect
Bubbles and trapped air in the lacquer film.
Cause of the defect
- drying too quickly due to too high temperature or wind speed.
- coating too viscous.
- coat too thick.
- trapped air in the substrate.
- formulation not optimised.
- unsuitable coating material .
Defect solution
The defective surface needs to be sanded clean with fine sanding paper (280 to 320 grain) until you have a smooth, level surface. Then one or two thin coats of suitable lacquer are applied in line with the treatment parameters.