PPG Training

Custom Restoration Guide 2018

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Page 25 of 155

26 NEW E-COAT PARTS PD-1120 Caution: Wear the proper safety protection when sanding, cleaning, mixing and spraying all materials included within this process. 26 Most Original Equipment Manufacturer (OEM) parts come from the factory coated with an e-coat primer. E-coat stands for "Electro-deposition Coating." The part is dipped into a primer bath and the e-coat adheres to the part with the help of an electrical process. E-coat is a very durable and corrosion-resistant coating so it should not be removed from the part. Some aftermarket manufacturers use a black shipping primer that is sometimes mistaken for e-coat. The test in Step 3 below will help you determine whether your part is e-coat or a shipping primer. 1 Inspect part for imperfections and damage. Determine if any repairs need to be made. (Follow all process documents for repairs made to the part.) 2 Clean entire part thoroughly with the appropriate PPG cleaner using a clean towel. Dry completely. 3 Test for e-coat by rubbing it, using a towel soaked with a strong thinner or urethane grade solvent. If the coating wipes off or softens significantly, remove it by sanding, and skip to Step 5. If coating integrity is maintained, it is a true e-coat. 4 When the primer is identified as an e-coat, follow these steps: a. To remove minor defects, lightly sand primer with 500-600 grit on a DA sander with an interface pad. Remove as little e-coat as possible. b. On edges, body lines and hard-to-sand, recessed areas, use a hand scuff pad. NOTE: On e-coated parts not exposed to direct sunlight (like the backside of a fender or the underside of a deck lid), it is not necessary to sand e-coat before applying epoxy primer. Thoroughly clean the part with the appropriate PPG cleaner, and then apply epoxy primer. 5 Repeat cleaning the entire part thoroughly with the appropriate PPG cleaner and a clean towel. Dry completely. Tack off the dried part. 6 Apply one coat of epoxy primer to bare metal cut-through areas. Allow flash time, then apply one coat of epoxy primer to the entire e-coat part. 7 Proceed to body work. Refer to the Body Filler Process, PD-1180.

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