Treatment of Metal Surface
Treatment of Metal Surface1. Filling/drying
Small cracks or pinholes in the sheet metal should be repaired with a body filler and sanded flat and smooth.
- Use a 2-part polyester resin putty.
- Mix the putty with the hardener in the correct ratio.
- Follow the body filler manufacturer's instructions.
- Mix the body filler and hardener quickly.
- Apply the body filler in several thin coats, without air bubbles.
- Do not try to cover the surface with one heavy coat.
- Apply the body filler over the damaged area with a putty knife using light pressure.
- After applying the body filler, allow 5 to 6 minutes of normal drying time, then force dry it with infrared lamps or an industrial dryer at 122 degrees F (6 degrees C).
NOTE: Follow the body filler manufacturer's instructions for drying time.
2. Polishing
The body filler is dry when a white mark appears after the surface is scratched with your finger nail.
-1 Thoroughly sand the body filler surface.
Use the double action sander and #80~#120 disc paper.
-2 Sand the surface evenly, particularly the area that was filled.
Use a flexible block and #120#180 sandpaper
-3 Featheredge the paint coat.
Sand the body filler surface until the proper dimensions are met.
Use the double action sander and #240-#320 #400 disc paper.
3. Air blowing / decreasing
Use alcohol, and wax and grease remover.
Also, clean and degrease the surfaces where masking tape will be attached.