Plastic Parts Paint6-15
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Paints6-1
Plastic Parts Paint6-15 |
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Plastic Parts Paint6-15
Features of Plastic Material
Check each of the plastic parts of solvent resistance and heat resistance temperatures before you do any repair work. Select the repair material according to materials of the plastic parts.
Plastic Parts Paint (cont'd)6-16
Features of Plastic Material (cont'd)
6-17
Use of the Repair Material (reference)
NOTE: Follow the materials manufacturer's instructions.
The use of a special polyester putty for PP bumper is described here:
- Filler
- Mixing Ration :
- Drying Time:
Air dry 20°C (68°F) 3 hours Force dry 60°C (140°F) 30 minutes
- Sanding filler
- Spray bumper primer (see page 6-19) on the area where the PP material was used.
- Primer surfacer
- The primer surfacer is used to protect the PP resin surface and fill cavities of flaws befort the intermediate coat and top coat.
Use the 2-component type primer surfacer (grey).
- Mixing Ratio:
- Intermediate coat and top coat
Use the 2-part polyester urethane top coat. Top coat is also used for an intermediate coat.
- Mixing Ratio:
- NOTE: Be sure to mix the correct amount of the hardener and softener.
- NOTE: Use a spray gun to apply the paint. Do not use a brush.
- Drying time:
Air dry 20°C (68°F) 6~10 minutes Touching by the finger. Almost hard 12~14 hours Completely hard 96 hours
- Force dry the intermediate coat and top coat.
- NOTE: Mix only an amount that can be used before it hardens.
Plastic Parts Paint (cont'd)6-18
Refinishing Processes
The following shows refinishing methods to various types of paint damage or defects. Be careful not to deform and damage the parts when force drying.
6-19
Preprocessing of Painting
Shallow Scratch:
Use a flexible block and #240~#400~#600 sandpaper
Hole / Deep Gouge:
Cut out and make any torn or burred area flat.
Use a knife, flexible block and #180~#240 sandpapers.
- Air blowing / degreasing
- Clean the damaged area thoroughly.
Use alcohol, and wax and grease remover.
Undercoating6-19
- Spraying primer
- Primer is used to fill cavities in the putty and primer surfacer.
- Spray primer on the exposed area.
- Spray the 2 to 3 coats of primer on 2 to 3 coats over the area you applied putty.
- Apply primer to the back of the bumper if the damage is a tear or hole.
- Bumper primer
- Warm the primer if the ambient temperature is below 50°F (10°C).
- Follow the bumper primer manufacturer's instructions.
- Use a spray gun and a brush.
- Drying
- NOTE: Take care not to let the heat lamp deform the bumper during the drying process.
- Dry the bumper primer thoroughly with an infrared dryer or other suitable method.
- Drying Time:
Air dry 20°C (68°F) 20 minutes Force dry 60°C (140°F) 10 minutes
Plastic Parts Paint (cont'd)6-20
Undercoating (cont'd)
- Filling / Sanding
- Apply putty to repair any holes or deep gouges.
- Apply the putty on the damaged area in 2 to 3 steps.
- Glue aluminium tape on the outside of the bumper, and apply putty from the other side of the bumper.
- Remove the aluminium tape after the putty dries, apply putty from the outside, and fill the hole.
Use a special polyester putty (Reference) and a putty knife.
- Sanding
- Sand the surface evenly, particularly at the area where the PP material and putty meet.
Use a flexible block and #240~#400~#600 sandpaper.
- Air blowing / degreasing
Use alcohol, a tack cloth, and wax and grease remover.
- Spraying primer surfacer
- NOTE: Spray the bumper primer (see page 5-13) on the area where the PP material was exposed and around the putty.
- Spray the primer surface wider then the putty and painted surfaces of bumper primer.
- Spray 2 to 3 coats to get 20 tot 30 microns of thickness.
- Use the 2-component type primer surface (gray) and a spray gun.
- Follow the materials manufacturer's instructions.
- Drying
- NOTE: Take care not to let the heat lamp deform the bumper during the drying process.
- Sanding
- After drying, wet sand the area of the intermediate coat.
Use the #600 sandpaper. NOTE: Do not use #600 or less.
- Air blowing / degreasing
Use alcohol, a tack cloth, and wax and grease remover.
- Also clean and degrease the surfaces where the masking tape will be attached.
6-21
Intermediate Coating
NOTE: You must do this procedure on the PP parts of the bumper and side sill panel.
- Masking
- Mask the area surrounding the damage to protect is from the intermediate coat overspray.
- Spraying the top coat enamel
- Spray the top coat enamel over the surface until the primer surfacer is fully covered.
- Spray 2 to 3 coats to get 15 to 25 microns of thickness.
- Use the 2-part polyester urethane top coat enamel and a spray gun.
- Mix the top coat enamel with the additive and solvent in the correct ratio.
- Follow the top coat manufacturer's instructions.
- Drying
- NOTE: Take care not to let the heat lamp deform the bumper during the drying process.
- After spraying top coat enamel, allow for 5 to 10 minutes of normal drying, then force dry it with infrared lamps or other industrial dryer.
- Polishing
- Check the top coat enamel has dried thoroughly, then sand the top coat enamel.
Use a flexible block and #600~#800~#1000 sandpaper.
- NOTE: Be careful not to sand down to the primer surfacer.
- When the painting repair is almost complete, polish the top coat.
Use a flexible block and #1500 sandpaper and compound.
- Air blowing / degreasing
Use alcohol, a tack cloth, and wax and grease remover.
- Clean and degrease the surfaces where the masking tape will be attached.
Plastic Parts Paint (cont'd)6-22
Top Coating
- Masking
- Mask the area surrounding the damage to protect it from the top coat overspray.
- Spraying top coat enamel /clear coat
- Spray 2 to 3 coats in double coat until the intermediate coat is fully covered.
- NOTE:
- Do not cover the surface with one heavy coat.
- Apply several thin coats.
- Use the 2-part polyester urethane top coat enamel and a spray gun.
- Mix the top coat enamel with the additive and solvent in the correct ratio.
- Follow the top coat manufacturer's instructions.
- After spraying the top coat enamel, allow for 5 tot 10 minutes drying time before you spray the clear coat.
- Drying
- NOTE: Take care not to let the heat lamp deform the bumper during the drying process.
- After spraying the clear coat, allow for 5 to 10 minutes drying time before you force dry it with infrared lamps of other industrial dryer.
- Polishing / buffing
- Check that the clear coat has dried thoroughly.
- Wet sand to remove any imperfections.
Use a flexible block, soap, and #2000 sandpaper.
- Using a buffer and compound, remove any polishing marks made from the sandpaper.
Use a buffing sponge, and buffing wool and compounds.
Finish up with buffing:
Wet sands with #2000 sandpaper and soapy water.
Remove moisture using compressed air. Finish using fine compound and very fine compound. Do not polish with a electric polisher. NOTE: Polish lightly.
Check the finished area at an angle, and make sure there are no polishing marks. Polish with ultra fine compound and a buffing sponge.
Wax the finished area.
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Paints6-1
Plastic Parts Paint6-15 |
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