Blistering
Small, spot-like, air-filled or water-filled blister shaped high-spots in the paint construction.
Their dimensions can range from pin-head to pin-point size in a closed paint film.
Arrangement and accumulation very variable. In the advanced stages, circular flaking of
the paint from the substrate. These are neither boils nor corrosion.
Cause/damage pattern:
Moisture absorption by substrate.
Insufficient drying of the substrate after wet sanding (especially on polyester material).
Humidity too high before painting; condensation formation because of temperature
fluctuations.
Pores/sink holes in substrate not sanded out.
Polyester material not covered.
Sweat from hands.
Salts and minerals in sanding water.
Spray air contaminated.
Repair of damage:
Sand away damage, matt sand remainder of surface, clean with silicone remover, fill and
re-paint.
Etching
The base paint is etched by the clear lacquer. This causes the aluminum pigments to
change their alignments. The color of the etched base paint seems more grey than that of
normal base paint. Result is that the surface structure of the clear lacquer becomes
increasingly more matt.
Cause/damage pattern:
Base painted too wet.
No intermediate flash-off time.
Layers too thick.
Repair of damage: