Appendix C1. PPG Industries Process Specifications

This Bulletin provides the maintenance painter with the proper procedures to be followed when painting Caltrans vehicles and equipment with PPG's Delfleet ® Evolution product system. These procedures must be followed to ensure the proper adhesion of paint. Use the following steps in conjunction with the correct PPG Product Information Bulletin.

1 Initial Cleaning and Preparation

• Power wash the entire unit and dry
• Air blow all surfaces completely
• Refinish area to be completely sanded using 220 grit dry sandpaper.
• Tape off unit
• Clean areas to be painted with PPG’s Delta ®, DRS 438 or Specialty Performance Product Cleaner SX1005. Refer to Bulletins FL-100 or PD-733 for additional information.
• Move to Primer Application

2 Body Work (if needed)

• Apply premium plastic body filler to needed areas

• Sand filler areas with 80 grit dry sandpaper

• Fill pinholes with a premium 2-component glazing putty.

• Sand glazed areas with 220 grit sandpaper

• Blow off vehicle/equipment

• Clean areas to be painted with PPG’s Delta ®, DRS 438 or Specialty Performance Product Cleaner SX1005. Refer to Bulletins FL-100 or PD-733 for additional information.

3 Application of Primer- DPU217 2.1 VOC Polyurethane Primer

Mix Ratio 2.1 VOC 5 parts DPU2171 part DPU2183-6 oz./RTS gallon of DX39. Shake primer before using

If unit has been sitting for 6 hours or longer from the time of initial cleaning and sanding, the unit should be resanded using 180 or 220 grit dry and recleaned. Before applying primer, metal needs to be up to temperature. (60° F) Mix PPG’s DPU217 primer. Refer to product information bulletin FL304. Pot life for 2.1 VOC is 1½ - 2 hours at 70° F. Use DX-53 to assist with pot life in high temp. (over 90° F)

Mix Ratio 2.8 VOC 5 parts DPU2171 part DPU218 3-6 oz./RTS gallon of DX39. 1 Part DRS Reducers Shake primer before using

When adding DRS Reducers in the 2.8 VOC blend, for best results, the DRS Solvents must be added last, after the addition of the DX39/53 Pot life for 2.8 VOC is 1½ - 2 hours at 70° F. Use DX-53 to assist with pot life in high temp. (over 90° F) Apply primer product following the procedures for the interior and exterior of unit achieving the appropriate film build above body filler or abraded areas. 2.1 - 2.8 VOC Wet Dry Min total film build per coat 1.8 mils 1.0 mils Max total film build per coat 2.3 mils 1.3 mils Apply 1 to 2 coats of DPU217 primer to the exterior areas of the unit achieving appropriate film build. Allow 10-15 minutes between coats.

4 Application of Topcoat-Delta® DHS 2.8 VOC Polyurethane

Mix Ratio 2 parts DHS 1 part DDH526       DHS COLOR: Matched to current vehicle color.

Blow off unit using clean white cloths in the process. Tape off unit. Mix PPG’s DHS topcoat color. Refer to product information bulletin FL500. Pot life is 1 hour at 70° F. (High heat and humidity will shorten pot life.)   Apply DHS topcoat until hiding is achieved. Flash time between coats is 10 to 15 minutes at 70° F. Wet Dry Min total film build per coat 1.5 mils .9 mils Max total film build per coat 2.0 mils 1.2 mils Apply color while maintaining a safe gun distance of 10-12 inches. Allow to flash for 10 minutes prior to force drying. Force dry for 60 minutes @ 120° F or 30 minutes @ 180° F.

7 Repair of Topcoat

• Remove defects with 320 grit or finer sandpaper or abrasive pad.
• Solvent clean with DX436 Cleaner. Refer to product information bulletin FL100.
• Tape off area.
• When the removal of coating does not expose bare metal:
  • Feather or scuff the surrounding area 1-2 inches beyond the affected area.
  • Apply the topcoat.
  • Melt the edge of repair coatings by applying DX830 Universal Blender.

• If the damage exposes bare metal:
  • Primer must be reapplied using PPG’s DPU217 @ 2.1 VOC.
  • Scuff the topcoat color area one-inch from where primer has been applied.
  • Apply topcoat color.
• Melt the edge of repair coatings by applying DX830 Universal Blender

8 Notes

Pot Life and Drying

• For every 15° increase in temperature, the pot life and dry time of a product is cut in half.
• For every 15° decrease in temperature, the time will double.
• Product cross-linking and curing of 2K catalyzed products slows significantly below 60° F. Paint will not dry properly if subject to cool temperatures during initial cure.

9 Safety

IMPORTANT : The above solvents and paint components contain materials that may be hazardous to your health. Read and be sure that you understand the warning messages on the labels of all components.

Follow instructions for positive airline respirator use. Wear eye and skin protection. Observe all applicable precautions.

See Material Safety Data Sheet and labels for additional safety information and handling instructions.