Sanding marks
Description of problem:
The sanding marks underneath the topcoat show through.
Causes:
– Ground coat is too thick.
– Insufficient drying time before the application of the topcoat.
– Sand paper used is too coarse.
– Substrates are soft, not dried enough or sensitive to the solvents present in the topcoat.
– Too low film build.
Preventive measures:
– Do not spray thick substrates. They may be dry on the surface but still
soft on the inside.
– Leave enough flash off time between coats.
– Use correct sandpaper grade.
– Use solvent test to identify soft substrates (i.e. T.P.A).
– Apply normal film thickness of the topcoat.
Remedy:
Depending on the seriousness of the problem, either sand lightly with P1200, use
rubbing compound and polish, or leave to dry completely, sand and repaint.
- Bleeding
- TEMATY SZKOLEŃ
- Drying is too slow
- BULLES SOUFFLURES
- Stripping / Banding
- Fish eyes
- Blistering
- Spider’s web
- ATMOSPHERIC POLLUTION
- CRACKING OR RIPPLING
- Loss of gloss
- POUSSIERAGE
- Rust
- Low gloss
- ADHESION PROBLEMS OF THE CLEAR COAT
- Orange peel
- Clouding
- Pin holing
- Poor adhesion
- SHRINKAGE / EDGE MAPPING
- Poor opacity
- Color offshade
- SOLVENT POPPING
- Whitening
- Runs
- Polish marks
- Sanding marks