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Dirt and dust in clearcoat
During application, dirt is attracted to the clearcoat and is trapped in the wet film
• Is seen as dark or light specks depending on the color of the surface
Dirt and dust in basecoat
Dirt entering wet film either from airborne contamination or from unfiltered base coat
10/13/2021 2:53:54 PM
Bleeding of peroxide hardener in Polyester Body Filler
Use of too much hardener
Insufficient mixing
Polyester not isolated
Edge mapping due to solvent penetration
Area where topcoat was sanded through to substrate not isolated
Isolated with unsuitable filler/primer
Filler/primer incorrectly applied
Insufficient drying of substrate
Orange peel
Incorrect spraying pressure or viscosity, spraying technique or application temperature
Unsuitable combination of solvents or low quality solvents
Insufficient sanding of substrate
Salt & pepper effect
•When using waterborne base coats: over wetting of metallic base coat produces very small black specks in light
base coat colors C
.JPG "Solvent popping")
Solvent popping
Solvent or air trapped in film, which then escapes leaving pop marks due to incorrect spraying viscosity, spraying pressure, flash-off times and drying times
10/12/2021 4:56:11 PM
Clouding
• Incorrect spraying viscosity, spraying technique, flash-off times, spraybooth temperature
• Defective spray gun set up, incorrect spraying pressure
• Unsuitable thinners
Water spotting
Topcoat not sufficiently cured
• Excessive film thickness, drying time too short
• Use of unsuitable thinner
• Incorrect hardener mixing ratio
• Wrong hardener used
Runs
Incorrect spraying viscosity, spraying technique, flash-off times between coats, and film thicknesses
• Defective spray gun set up
• Incorrect spraying pressure
• Temperature of paint, substrate or spraybooth too low
