| Aluminum | Cleaning and etching prior to Spot welding |
| | Clear Chromate conversion |
| | Yellow Chromate conversion TYPE I, II and III |
| | Clear Anodize |
| | Black Anodize |
| Steel | Zinc Phosphate coating |
| | Electro zinc plating with clear chromate |
| Electro zinc plating with yellow chromate |
| Stainless Steel | Passivation |
