Operation CHARM: Car repair manuals for everyone.

Undercoating

Undercoating

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

2. Spraying primer surfacer




- Spray the primer surfacer over a wider area than the body filler and the exposed surface of the paint film.
- Spray 2-3 coats to get 30 microns of thickness.
- Use the 2-part urethane primer surfacer and a 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 the alcohol, wax and grease remover.
Also clean and degrease the surfaces where the masking tape will be attached.