StoGuard® Primer is used to improve the initial bond of StoGuard® Tape to substrates and tape to tape overlaps. It is a solvent free rubber-resin emulsion, which upon drying produces a pressure sensitive film. It provides excellent quick grab and adhesion to a variety of surfaces, including plywood, OSB, and glass mat gypsum sheathing, CMU with flush joints, and cast-in-place or pre-cast concrete.