PRODUCT DATA SHEET 321 HS UNDERCOAT R1100/R3100 or R8100/R3100 Features & Uses 321 HS Undercoat is a low VOC epoxy finish primer. Utilizing an advanced resin technology and optimized pigment package 321 HS Undercoat can be applied with excellent flow and levelling properties previously unseen from high solids primers. With a VOC of just 340g/lt as applied and an easy-sand, long overcoating film 321 HS Undercoat is the ideal primer for all Awlgrip topcoats. Can be applied by spray, brush or roller. Specification Data Type: Low VOC Epoxy/modified aliphatic amine Available in 1 gallon containers filled to 2.84lt (base), 1 quart container (converter), 1 quart kit (mixed 1 quart – White only) Theoretical Coverage: 200 Sq. Feet/gallon (4.9m2 / liter) at 5 mils (125 microns) dry film thickness. Calculated for mixed base and converter without reduction. Coverage calculations are based on theoretical transfer efficiency of 100%. Actual coverage rate obtained will vary according to equipment choice, application techniques, part size, and environment. Recommended Wet Film Thickness: 9 mils (234 microns) applied in 2 coats Recommended Dry Film Thickness: 5 mils (125 microns) applied in 2 coats No more than 6 mils (150 microns) should be applied per coat. Multiple coats will be required to achieve the correct DFT. Recoatability at 77°F (25°C): Minimum without sanding: With itself: With topcoat: Maximum without sanding: With itself: 1 hour 24 hours 6 months* Maximum after sanding: With topcoat: * Ensure surface is clean and dry prior to recoating. Sanding is recommended before overcoating with topcoat. For optimal appearance, 321 HS Undercoat should be left to dry for at least 72 hours before sanding and topcoating; the longer the curing time, the better the finish. VOC: White Base (R8100) Gray Base (R1100) Converter (R3100) 232g/lt or 1.9 lbs/gallon 232g/lt or 1.9 lbs/gallon 663g/lt or 5.5 lbs/gallon Mixed components (as supplied) All trademarks mentioned in this publication are owned by, or licensed to, the AkzoNobel group of companies. ©AkzoNobel 2015 Page 1 of 3 – Revision 8 – June 2015 – 321 HS Undercoat

PRODUCT DATA SHEET 321 HS UNDERCOAT R1100/R3100 or R8100/R3100 Application Equipment BRUSH AND ROLLER Brushes must be recommended for use with solvent containing epoxy or urethane coatings. Natural bristle brushes work best. Do not use products recommended for water based coatings. Roller covers have similar requirements. They can be either foam or conventional mohair type, but must be solvent resistant. Corona Brushes (813-885-2525) and Redtree Industries (973-481-0200) are good sources for brushes and roller covers. The Corona Urethaner or Redtree Chinese Ox would do a good job with 321 HS...

PRODUCT DATA SHEET 321 HS UNDERCOAT R1100/R3100 or R8100/R3100 Application Instructions Spray Application: Apply two coats of 321 HS Undercoat at a total of 9 mils (234 microns) ensuring no more than 6 mils (150 microns) per coat wet film thickness yielding 5 mils (125 microns) DFT. Brush or Roller Application: Apply 2 coats at 4 mils (100 microns) WFT yielding 2 mils (50 microns) DFT. Allow 8 hours between coats at 77°F (25°C). Light sanding between coats will improve appearance. WARNING: Do not apply paint materials to surfaces less than 5°F (3°C) above dew point, or to surfaces warmer than...