Operation CHARM: Car repair manuals for everyone.

Soft Chipping Guard Primer Coat

Coating Procedures

NOTE: This section covers the application of the soft chipping primer to the replacement part.

1. Sanding the replacement part

WARNING: Wear goggles or safety glasses to prevent eye injury.

Sand the area to be painted with #240-#400 sand paper.

NOTE:
- Do not oversand the edges or corners of the part.
- Do not expose bare metal.

2. Air blowing/degreasing

WARNING:
- Do not use high air pressure; use only an approved, 210 kPa (2.1 kgf/sq.cm, 30 psi) air nozzle.
- Wear goggles or safety glasses to prevent eye injury.
- Paint thinner is flammable. Store it in a safe place, and keep it away from sparks, flames or cigarettes.


Clean the surface with compressed air and wax and grease remover.

3. Masking
- Place masking tape or paper around the surface to be painted.
- Cover as wide an area as possible with tape or paper to keep primer from spreading.

4. Spraying chipping guard primer
- Stir the primer thoroughly.
- Put the primer in a beaker and weigh the needed amount of primer to be used.
- Mix the hardener into the primer, following the manufacturer's instructions.






NOTE: Measure the primer and hardener so they are in correct ratio.

- Add the specified thinner to the mixture of hardener and primer to attain the proper viscosity for spraying.
2C 68 degrees F (20 degrees C) 18 sec ± 1
- These substances are not available in the using DuPont's 123 Vinyl Coating, or Sherwin-Williams' Vinyl Gravel Guard. Follow the manufacturer's instructions for application.
- Use the following materials:
- Spies Hecker Permacron 4:1 Surfacer 4:1 (Hoechst)
- Standox 2K 4:1 Special Filler (Herberts)




- Once mixed with the hardener and thinner, the primer must be used within the times shown.

WARNING:
- Most paints contain substances that are harmful if inhaled or swallowed. Read the paint label before opening the container. Spray paint only in a well ventilated area.
- Cover spilled paint with sand, or wipe it up at once.
- Wear an approved respirator, gloves, eye protection and appropriate clothing when painting. Avoid contact with skin. If paint gets in your mouth or on your skin, rinse or wash thoroughly with water.
- If paint gets in your eyes, flush with water and get prompt medical attention.
- Paint is flammable. Store it in a safe place, and keep it away from sparks, flames, or cigarettes.


- Fill the gun's paint cup with the primer. Use a strainer when pouring the primer into the cup.
- Primer should never be applied to a dirty or greasy surface. Before spraying, blow dust and dirt off the surface and clean with wax and grease remover.

(Method of spraying)
- Do not try to cover the surface with one heavy coat. Apply several thin coats.

NOTE:
- Spray coat 4-5 coats to get 20 microns of thickness, as one coat deposits 5-7 microns.
- Spray the primer at 250-300 kPa (2.5-3.0 kgf/sq.cm, 35.6 - 42.7 psi) pressure. Spraying with improper air pressure will cause imperfections.
- Open the gun 3-4 turns.
- Wipe up unwanted primer immediately with thinner.

5. Cleaning spray gun
- After spraying, be sure to clean the spray gun thoroughly with thinner or solvent.
- The gun will be permanently clogged if the primer is allowed to dry.




6. Drying
- After spraying the chipping guard primer, air-dry for 7-10 minutes to evaporate the thinner in the primer. Then dry it with infrared lamps at 176 degree F (80 degree C) for 30-40 minutes.

NOTE: Insufficient baking may cause pinholes if the primer coat is too thick.

- The temperature lamps and drying time recommendations should be followed closely.

7. Intermediate and Top coating
- Sand the chipping guard primer film with #280-#400 sandpaper.
- Follow the intermediate/top coating Procedures.