Acoustic sealer is the sealer they use for sealing joints when installing vapour barrier. My garage was insukated and vapor barrier installed about 16 years ago. When I installed my popcan heater I took a sheet of gyp-roc off the wall to cut my vent holes and the acoustic sealant was still soft and sticky, pretty much like when I applied the stuff. When I used to do construstion work we call it Black Death. The sealant was black and if you ever got any on you, you would have to scurb till you just about died.
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