Another temp gauge questions.... to tape or seal? (Page 2/2) olejoedad OCT 31, 05:30 PM I also prefer the paste, just a very small amount for this application. The tape is fine if used properly (1 1/4 wrap), but most people use two or three wraps and that's not good. Brass into steel will seal without assistance when properly tightened, but steel into steel (or aluminum) needs the dope or tape.