What is mastic HVAC?

Mastic is a water-based paste that can be applied to seams in an HVAC system in order to help seal the system. It is typically used to fill crevices that an HVAC tape can’t reach, especially because of its peanut butter-like consistency, which allows it to conform to any shape.

How long does Pookie take to dry?

GREY POOKIE can be applied by brush, caulking gun, or trowel. CURETIME: Allow 48 hours dry time minimum (depending on temperature, application and humidity), prior to test or system start-up.

Is Pookie flammable?

The “original” Pookie White Duct Sealer!! Duct Sealant. Permanently flexible, non-flammable wet or dry. For use indoor or outdoor.

How long does duct mastic take to dry?

Normally it takes about 12–24 hours to set up and dry. I would wait at least that long before you insulate it (if that’s what you’re doing). If you are wondering if you can turn on the fan before it dries, you can if it’s standard low pressure residential duct system and it has set up for a couple hours.

How do I seal my HVAC plenum?

For long-term results, seal the plenum with aluminum tape, not ordinary duct tape. Duct tape is backed with an adhesive which is broken down by thermal cycling (repeated cycles of warmer and cooler temperatures — exactly what you will get in an HVAC system).