In my opinion that is the best way to insure a pipe won't leak.i learned it the hard way early.in my career I drained the heating piping of a 3 story apartment building to the bottom floor to replace a valve on the bottom floor and used Teflon tape on the new valve I refilled the building and the damn thing dripped no matter how tight I made it. Had to empty the building again and use dope and tape to fix it. From then on I used both when I didn't want any dripping.