Delamination of the total paint system from the substrate.
- Insufficient cleaning of the plastic substrate
- Insufficient sanding
- Unsuitable cleaner or degreaser used
- Plastic part not heated before painting – this applies mainly to PU foam parts and polyamide (PA)
- Plastic primer or plastic additive not used
HOW TO AVOID
- Thoroughly clean the plastic substrate with Glasurit 541-30 Universal Cleaner for Plastics or Glasurit 700-10 Degreasing and Cleansing Agent. If the substrate is very dirty or textured, clean with a sanding pad or a scrubbing brush. Clean the substrate before and after sanding.
- Use recommended sanding material. Use a sanding pad, where an irregularly shaped part is to be sanded (for example, radiator grill, bumper etc.).
- Clean with Glasurit 541-30 Universal Cleaner for Plastics or Glasurit 700-10 Degreasing and Cleansing Agent. Only these cleaning agents will remove any mould-release agent residues from the substrate.
- ‘Heating’ means eliminating the release agents from the substrate by heating the car part (for 1-2 hours at a maximum of 60°C). Plastic parts with pores must be heated before painting as mould-release agents might have entered these pores during production. This applies mainly to PU foam parts. The plastic part must be placed in such a way that it will not become deformed during heating. Thoroughly clean the substrate using Glasurit 541-30 Universal Cleaner for Plastics or Glasurit 700-10 Degreasing and Cleansing Agent before and after heating.
- Use Glasurit 285-31 VOC HS-Non-Sanding Filler and/or Glasurit 522-10 Plastic Additive according to Refinishing Systems S 3/S 3a.
Remove the paintwork completely and refinish according to Refinishing System S 3. Do not use a paint stripper as this might damage the plastic!