PPG Training

Custom Restoration Guide 2018

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88 PINCHWELD PRIMING PROCESS PD-0570 Caution: Wear the proper safety protection when sanding, cleaning, mixing and spraying all materials included within this process. A two-component epoxy primer must be used on bare metal areas of pinchwelds when installing stationary glass using urethane repair materials. If corrosion is present or if sheet metal repairs or metal replacement are required, the pinchweld flange must be primed in order to restore the strength of the bonding area. 1 Perform all necessary metal repairs to pinchweld areas on roof, pillar and other panels where stationary glass will be installed. 2 Final sand all bare metal and body filler areas with P180 grit using a DA sander. Do not apply body filler to pinchweld area. 3 Final sand and featheredge all adjacent painted areas with P320 grit on a DA sander. 4 Clean the area to be primed thoroughly with the appropriate PPG cleaner, using clean towels. Dry completely. 5 Mask as necessary to protect vehicle from overspray. 6 Apply epoxy primer to the repair area allowing each coat to flash to a uniformly dull appearance before applying the next coat. 7 Allow the epoxy primer to air dry according to the PDS. Do not force dry. REMEMBER to mask off primed pinchweld area BEFORE color and clearcoat application. Windshield adhesive must only be applied to a clean, epoxy primed surface.

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