Metal Surface Prep – Bare Aluminum

Caution: Wear the proper safety protection when sanding, cleaning, mixing and spraying all materials included within this process.

To ensure proper corrosion protection and adhesion, specific steps must be followed when preparing and priming bare aluminum substrates. These procedures apply to a damaged painted OEM panel or an e-coated OEM replacement panel.

STEP ACTION PRODUCTS
1 Clean entire part using an approved solvent-based wax and grease remover (check local regulations) and a clean towel. Dry thoroughly. Follow with waterborne pre-cleaner and a clean towel. Dry thoroughly. DX330* or similiar followed by SWX350
2 Inspect part for imperfections and damage. Determine what repairs should be made if any (follow all process documents for repairs made to the part).  
3 Prepare bare aluminum areas for priming. After making any necessary repairs, sand exposed aluminum using a DA sander with 120 - 180 grit sandpaper and interface pad. Featheredge existing finish using a DA sander with 320 grit sandpaper and interface pad. Re-clean entire part. Spot treat or prime bare aluminum areas as outlined below in step 4A, 4B or 4C.

IMPORTANT: To avoid galvanic corrosion, never use the same piece of sandpaper on both steel and aluminum. Avoid cross contamination of airborne steel and aluminum particles generated in the same shop areas.

CAUTION: Under proper conditions, aluminum dust can be combustible.
120 - 180 grit and 320 grit sandpaper
4 Prime or chemically treat bare aluminum substrates immediately.

IMPORTANT: Oxidation can form on exposed aluminum surfaces in as little as 15 minutes. If necessary, scuff or re-sand prior to priming.
 
Option 4A** Etch primer followed by surfacer or sealer and PPG topcoat system (refer to PD-0700 or PD-0700WB).

IMPORTANT: Do not apply epoxy primer, body filler, or topcoat directly over etch primer.
SX1071
Option 4B** Epoxy primer followed by body filler or surfacer or PPG topcoat system (refer to PD-0700 or PD-0700WB). DPLF* or DPLV
Option 4C** DX metal treatments* followed by epoxy primer and body filler or surfacer or PPG topcoat system (refer to PD-0700 or PD-0700WB).

IMPORTANT: Do not apply etch primer, DPLV, body filler, surfacer, or PPG topcoat system directly over DX metal treatments.
DX533, DX503*, and DPLF*
NOTE: To prevent dissimilar metal corrosion where bare metals make contact with one another (bolts, rivets, hinges, etc.), ECK® corrosion coating (Electrolysis, Corrosion, Kontrol) should be applied. Refer to ECKPB01 for complete details. ECK corrosion coating

*Cannot be used in some areas due to VOC or heavy metal restrictions. Refer to local regulations.

**Refer to individual product sheets for complete mixing and application procedures and approved product systems.