Undercoating

Undercoating

1. Masking
Mask the area surrounding the damage to prevent over spray from primer surfacer.
Use masking tape and paper.

2. Spraying the primer surfacer
- Spray the primer surfacer over a wider area than the body filler to the exposed surface of the paint film.
- Spray coat 2-3 coats to get 30 microns of thickness.
- Use the 2-part urethane primer surfacer and spray gun.
- Mix the primer surfacer with the additive and solvent, and in the correct ratio.







- Follow the primer surfacer manufacturer's instructions.

3. Drying
After spraying primer surfacer, allow for 5-10 minutes of normal drying time, then force dry it with infrared lamps or other industrial dryer.

NOTE: Follow the primer surfacer manufacturer's instruction for drying time.

4. Polishing
Check that the primer surfacer has dried thoroughly, then sand the primer surfacer.




Use the double action sander and #320-#400-#600 disc papers.

5. Air blowing / degreasing
Use alcohol, wax, and grease remover.
Also clean and degrease surfaces where the masking tape will be attached.