PROFLEX SP1 Multipurpose Sealer / Primer is a pure acrylic based, solvent free product with multiple uses. SP1 may be used as a bonding agent with other Proflex surface preparation products, modified mortars, adhesive, and membranes when adhering to difficult substrates such as gypsum based concrete, epoxy coatings, vct, non-cushioned sheet vinyl, glazed tile, terrazzo, glass, and metal. SP1 can also be used to prime metal and resin backed tile to allow for modified mortar installation. *SP1 can also be used to encapsulates old adhesive residue, (including cut-back asphalt adhesive)