3M Scotchfil Electrical Insulation Putty Tapes This tape can be wrapped, stretched or molded around irregular shapes for quick, smooth insulation build-up. Use 3M Scotchfil putty to insulate connections up to 600 volts and to round out high-voltage connections to gear, smooth bus bar irregularities, and make a moisture seal at ground wire exits in high-voltage splice. . . Pack of 1