PPG Training

Custom Restoration Guide 2018

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53 PLASTIC BODY FILLER Caution: Wear the proper safety protection when sanding, cleaning, mixing and spraying all materials included within this process. PD-1280 PPG does not manufacture any plastic body filler or plastic repair epoxy so the procedure may vary across each supplier. Determine if the part you are working with is either flexible or rigid. Choose the appropriate filler for either rigid or flexible. 1 Scuff the bare plastic part if not already sanded. Clean off and tack the area where repair or filler will be applied. For best results, using a plastic repair or filler epoxy is recommended. 2 Based on the filler you choose, check the manufactuer's recommendation for proper adhesion promoter and wait time. a. Apply plastic adhesion promoter to repair area and let flash dry. b. Apply thin tight coats to repair area, building up to fill as you spread, rather than a loose thick coat. Spread as large of an area as possible. 3 Block filler with no coarser than P80 grit on a hand block to rough shape the filler. Move up to a finer grit and finish with a finer grit. REMINDER: Plastic tends to "hair" when sanded with coarse grits and may not come out with a finer grit sand paper. Use the finest paper possible while still shaping the part. Additional priming may be necessary. To more easily identify low areas, apply Guide Coat to body filler before final sanding. Finish sand filler with P150 grit sandpaper until guide coat is gone. If low spots still exist, reapply filler. Do not proceed to Primer Surfacer stage until part is straight. Adding filler AFTER primer filler should be avoided to prevent possible adhesion, staining and shrinkage concerns. 4 Re-clean entire part thoroughly with the appropriate PPG cleaner, using clean towels. Dry completely. Tack off the dry part. 5 Apply plastic adhesion promoter to bare plastic cut-through areas. 6 Apply appropriate primer surfacer, based on the part's flexibility, then proceed to Sanding Primer Surfacer PD-1590. 7 Proceed to Paint Application.

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