Advice on paint defects
Cracks of various lengths and depths.
- Inappropriate paint system used on thermoplastic substrates (direct use of polyester body fillers/fillers, wash primers/synthetic resin products on TPA) which caused the TPA surface to soften.
- Refinished paintwork insufficiently cured (too little or no hardener used).
- Inappropriate paint system used:
- Wash primer overcoated with polyester products.
- Synthetic resin or nitro-cellulose paints overcoated too early.
- Cracks on plastic parts:
see chapter on "Faults in painting plastics".
- Exposure to strong UV radiation, extreme temperature fluctuations.
- Flash-off time too short in wet-on-wet process.
- Total film build too high.
How to avoid
- Apply a suitable paint system to the substrate.
- Ensure correct hardener quantities.
- Use correct paint system.
- Plasticise materials (see chapter "Faults in painting plastics").
- There are no complaints about "cracking" with regard to present Glasurit automotive refinish products.
- Respect recommended flash-off times.
- Check paint system and film thickness of old paintwork and sand down or strip down, if necessary.
Please note: For older car models, use refinishing processes for solvent-sensitive paintwork. Classic Car system S 1a.
Sand down to the "sound" layers. Refinish using the recommended undercoats and topcoats.