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Royston Roybond 747 is a primer used with butyl and elastomeric products. Roybond is a liquid adhesive that creates a permanent bond between the tape and the substrate. Roybond 747 can be used for substrate temperatures up to 165°F (74°C). Roybond 747 is available as a liquid that is applied via brush, roller or spray equipment or as an aerosol spray can.

A 4 mil WFT (1.0-1.5 mil DFT) of Roybond 747 or Roybond 747 Aerosol should be applied and allowed to dry prior to application of the tape.