Instructions / Assembly

Duct Sealant Instructions
Recommended Uses
• Sealing joints, seams, and duct wall penetrations on metal air duct.
• Sealing connections on flexible duct or fiberglass duct board.
• Will handle up to 15 inches of water column pressure.
Directions For Use
• Surfaces should be clean, dry and free of dirt, oil and any foreign matter.
• For sheet metal duct sealant should be applied according to SMACNA standards.
• Apply to all connections or penetrations in the duct wall including sheet metal screw heads
and tie rods. Make sure to brush sealant into seams.
• For round and oval spiral duct apply to male section of fitting and apply a 2” band around
outside of joint, covering all screws.
• For rigid fiberglass duct assemble per manufacturers recommendations and apply a 3” by
20 mil band of sealant to the joint, embed a fiberglass scrim (5 mil, 20 x 10 plain weave,
1.75 oz. per sq. yd.) in the sealant, then apply another 20 mil coat of sealant over the scrim.
• For flexible duct apply a 2” by 20-40 mil band of sealant between the end of the duct and
collar on all connections.
Pressure Testing
• Allow at least 48 hours before pressure testing.
• In some environments in make take longer for the mastic to cure, adjust accordingly.
Clean Up
• Use warm water and soap.
NOTE: DO NOT APPLY WHEN RAIN OR FREEZING TEMPERATURES WILL OCCUR
WITHIN 36 HOURS. DO NOT THIN.