Causes
- Solvent being trapped within primer or topcoat during the drying process
- Insufficient flash-off between coats
- Insufficient flash-off before force drying / stoving
Prevention
- Do not under-thin materials, this can lead to blistering
- Allow primers and topcoats to flash-off (refer to technical data) before overcoating or force drying
- Do not use very fast thinners in warm conditions, as this leads to heavy applications technique. A slow thinner is advised
Rectification
The blistering should be flatted down to a sound surface and re-painted
