alternative to Benjamin Moore ultraspec 57300 vapor barrier primer

I picked up 5 gallons a month or so back, no problem. I’m priming drywall and my drywall is my air and vapor barrier on the inside, cz6 in S.… I picked up 5 gallons a month or so back, no problem. I’m priming drywall and my drywall is my air and vapor barrier on the inside, cz6 in S.…Read MoreGreenBuildingAdvisor