You will need an adhesion promoter, here are instructions from
PPG;
Quote:
1. Sand substrate with 400 grit paper. Blow off surface.
2. Clean with SX1004 Plastic Cleaner & Prep.
Application Procedure: 1. Apply 1 light coat of SX1050 Plastic Adhesion Promoter, then 1 full wet coat,
allowing 5 minutes between coats. Use 20-25 psi at the gun for conventional equipment
and 4-6 psi at the cap for HVLP equipment.
2. Allow to flash a minimum of 10 minutes and maximum of 30 minutes before topcoating.
3. Apply tinted PPG Sealer if desired. Proceed with the appropriate PPG Topcoat system.
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