Advice on paint defects
Blister-like surface defects due to solvent entrapment in the surface of the paint film.
- Coats applied too thick.
- Hardener and/or Thinner too fast.
- Flash-off time between individual paint coats too short.
- Flash-off time before baking or Infra-red drying too long.
- Insufficient distance between IR lamps and object causing too high a temperature.
- When using a wet-on-wet system, too short a flash off between coats.
How to avoid
- Keep to recommended film builds.
- Use correct choice of hardener and thinner for the working temperature available (see temperature table).
- Keep to recommended flash-off times.
- When using Glasurit products, no flash-off time is required before baking.
- Keep to recommended distances and intensities when drying with Infra-red.
- Keep to recommended film builds and flash off times between coats.
For surface defects caused by solvent boiling, the paint coats must be sanded back to a sound substrate. Refinish using the correct choice of primers and top-coats. If the bubbles are not completely removed, pin-holes will appear when the next coats are applied (see chapter on "Pinholes").