Prepping Bare Plastic - VOC Compliant System

PD-0200C Plastic Prep CompliantTo ensure good adhesion over a bare plastic substrate requires that it be cleaned properly and coated with adhesion promoter before application of an undercoat. This standard operating procedure (SOP) covers using PPG’s VOC compliant system for preparing unprimed plastic. The system features three essential products from PPG's OneChoice® line of specialty products: SU4901 Clean and Scuff Sponge, SWX350 Waterborne Pre-Cleaner and SU470LV 1K Adhesion Promoter — also available as an aerosol as product code SUA470LV.

Follow along with the outlined process below to learn how to properly prepare plastic parts for a repair.


PD-0200C: PREPPING BARE PLASTIC (VOC COMPLIANT) STANDARD OPERATING PROCEDURE

  1. Ensuring Good Adhesion
    To ensure good adhesion over a bare plastic substrate requires that it be cleaned properly and coated with adhesion promoter before application of an undercoat.
  2. PPG's VOC Compliant System
    PPG’s VOC compliant system for preparing unprimed plastic is comprised of three essential OneChoice® products: SU4901 Clean and Scuff Sponge, SWX350 Waterborne Pre-Cleaner and SU470LV 1K Adhesion Promoter — also available as an aerosol, product code SUA470LV.
  3. Clean and Scuff
    To begin, remove the pre-saturated sponge from the SU4901 Clean and Scuff package, which is sufficient for cleaning a full-size bumper. Use the sponge to saturate the bumper, then scuff the substrate thoroughly using moderate pressure to avoid grooving the plastic.
  4. Rinse
    Rinse thoroughly with water. If the water beads up instead of running off in a sheet, you’ll need to clean and scuff further.
  5. Dry and Wipe
    Blow dry and wipe with a clean cloth.
  6. Perform Surface Check
    Now, check to ensure that the entire surface is totally de-glossed and you’re ready to move in the paint booth for final cleaning with a compliant cleaner.
  7. Final Cleaning
    Apply a generous amount of the cleaner on the surface with a handheld spray bottle, and wipe the surface to remove any contaminants. For maximum results, wipe while the surface is still wet to eliminate smearing of contaminants.
  8. Flash and Adhesion Promoter
    Allow 3-5 minutes of flash time, then apply a light coat of the adhesion promoter. Use a spray gun for an entire bumper cover.
  9. Final Flash
    Allow 10 minutes to flash, or wait until the surface has dried to a matte finish.
  10. Final Surface Check and Primer Sealer if Needed
    Check the surface for any scratches, chips or other imperfections. If any imperfections are found, you’ll need to apply a primer surfacer. If not, apply a coat of primer sealer mixed in the correct G-shade recommended for the basecoat color you'll be spraying.

The part is now ready for the color application. To maximize flexibility and chip resistance for the finish, we recommend adding a flexible additive to the primer surfacer, sealer and clearcoat. Follow the application instructions on the product’s technical information bulletin.

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