3M 94 Tape Primer is an adhesion promoter for use in conjunction with 3M Acrylic Foam VHB Tapes. For use on many plastics, rubber, metal, polyethylene, polypropylene, ABS, PET/PBT blends, concrete, wood, glass, painted and bare metal substrates. Coverage provided is 600 square feet per gallon of primer (or 1-1/4 square inches per 0.66mL ampule)