Rust Prevention5-1 Soft Chipping Guard Primer Coat5-8

Soft Chipping Guard Primer Coat5-8

General

The removal of paint and undercoating by stone chips immediately exposes metal to the atmosphere, causing it to oxidize. The thickness of this oxidation increases if the process continues unchecked. The soft chipping guard primer protects against damage due to the impact of such objects.

Sectional View of Paint Coats:

Top coat

Intermediate coat + Chipping guard primer

Electrodeposition of primer

Base metal

The soft chipping guard primer coat is applied over the E.D. (Electrostatically Deposited) primer. It is followed by guide coating and top coating.

The soft chipping guard primer produces a smooth surface when dry. It should be sprayed so the thickness of the protective film is 20 microns.

Basis Rules for Repairing a Soft Chipping Guard Primer Coat:

Soft chipping guard primer coat is then applied to the most susceptible area (see page 5-11) .

Spray the primer surface (2-part urethane primer surfacer) on the soft chipping guard primer coating areas when you replaced parts using soft chipping guard primer coat.

	WARNING
Wear goggles or safety glasses to prevent eye injury. Ventilate when spraying undercoat.

1. Sanding the replacement part.
   

   NOTE:

   Do not oversand the edges or corners of the part.

   Do not expose base metal.

   Use a double action sander and #400 disc sandpaper.

   
   

   
   

   
   

   

   
   

2. Air blowing / degreasing
   

   Use alcohol, and wax and grease remover.

   
   

   
   

   
   
3. Masking
   

   Use masking tape and paper.

   
   

   
   

   
   
4. Spraying primer surfacer
   

   Sprayer about 4 to 5 coats to get 20 microns of thickness. One coat deposits about 5 to 7 microns.

   Do not try to cover the surface with one heavy coat. Apply several thin coats is recommended.

   Use a 2-part urethane primer surface 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.

   
   

   
   

   
   

   

   
   

5. Drying
   

   After spraying primer surfacer, allow 7 to 10 minutes of drying time, then force dry it with infrared lamps or an industrial dryer.

6. Polishing
   

   Check the primer surfacer has drie thoroughly, then sand the primer surfacer.

   Use a double action sander and #400~#600 disc sandpaper.

   
   

   
   

   
   

7. Intermediate coating and top coating
   

   Refer to page 6-8 through page 6-10 of this manual for the painting procedure.

5-9

Coating Diagram

Rust Prevention5-1 Soft Chipping Guard Primer Coat5-8