National Applied Construction Products Inc. has developed the NAC TAC for its adjustability and strength with the contractor in mind. The NAC TAC is a neoprene-based primer that cures from the top down, which enables the ECB, Strataflex, and SAM3 to be installed and then re-adjusted. The NAC TAC has a very strong chemical bond with the substrate after 24-48 hours, and the tile can be set immediately after the membrane is installed, the company says