When preparing bare and galvanized steel substrates, it is important to follow proper surface preparation and priming recommendations to ensure good adhesion and corrosion protection. This standard operating procedure (SOP) covers surface preparation of bare and galvanized steel.
PD-0115S: Metal Surface Prep - Bare & Galvanized Steel
Step-by-Step Instructions
- A technician should review a work order to ensure that all parts to be painted are present and repairs are understood.
- Clean the entire part and use a local VOC regulation surface cleaner and a clean towel. Dry thoroughly.
- Inspect the part for imperfections and damage. If repairs are necessary, refer to all process documents for detailed instructions.
- Prepare bare steel areas—after making any necessary repairs, sand exposed steel using a DA sander with P120-P180 grade paper and interface pad. Use a general-purpose scuff pad or equivalent on edges, body lines, and recessed areas. Re-clean the entire part.
- Prime or chemically treat bare steel substrates immediately. Oxidation can form on exposed aluminum surfaces as quickly as 15 minutes. If necessary, scuff or re-sand before the primer process.
Method 1: Etch Primer - refer to Product Data Sheet for detailed instructions.
Method 2: Epoxy Primer - refer to Product Data Sheet for detailed instructions.
To prevent dissimilar metals corrosion where bare metals make contact with one another (bolts, rivets, hinges, etc.) ECK® (Electrolysis, Corrosion, Kontrol) should be applied. Refer to ECKPB01 for complete details.
*Cannot be used in some areas due to VOC or heavy metal restrictions. Refer to local regulations.