R 3 E is a two part solvent free epoxy primer for use with ARDEX ENDURA polyurethane screeds and self-smoothing epoxy floor coatings. Blind with Fine Aggregate and use as a primer prior to applying thick applications of the ARDEX ENDURA K 80 Industrial Floor System, or other appropriate ARDEX ENDURA cement-based products.Where surfaces are very porous, more than one coat of primer may be required to achieve the desired bonding efficiency.