3M™ Scotchrap™ pipe prime is a quick-drying, non-sag rubber base primer that permeates metal surface pits and irregularities, preparing the surface for tape application. compatible with the special adhesive on 3M™ Scotchrap™ Tapes, it enhances adhesion. To be used with 3M™ Scotchrap™ corrosion protection tapes 50 and 51. 1 gal can.