PPG Training

Custom Restoration Guide 2018

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Page 32 of 155

33 BARE METAL PREPARATION PD-1154 Caution: Wear the proper safety protection when sanding, cleaning, mixing and spraying all materials included within this process. There is sanding AND metal treatment in this process. This process is used for rust-pitted metal and old body filler, and bare metal that has been exposed for more than 30 minutes. One reason may be to create a "tooth" or scratch so that subsequent paint applications adhere well. 1 Sand the entire part using a DA sander with P120-P180 grit and an interface pad. Remove rust pits and old body filler. Clean with approved the appropriate PPG cleaner. Tack off surface. 2 Perform metal treatment* process (reference PDS OC-36 for detailed instructions). Steel: Use SX579 / SX520 Aluminum: Use SX533 / SX503 CAUTION: Do NOT apply etch primers or body filler directly over these metal treatment products. *Cannot be used in some areas due to VOC or heavy metal restrictions. Proceed directly to epoxy primer. 3 Apply epoxy primer. REMINDER: When left unprotected, bare steel begins to oxidize (flash rust) after 30 minutes at 50% relative humidity. Sanded aluminum begins to oxidize almost immediately. Protect with epoxy primer. 4 Complete welding, rust repairs and sheet metal patching. 5 Clean with the appropriate PPG cleaner. 6 Reapply epoxy primer for corrosion protection. 7 Proceed to body work. Refer to the Body Filler Process, PD-1180.

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