covjohn

i'm not a plumber but we used to use ptfe tape to seal up air pipes on trucks. to stop it scrunching up and becoming useless as a sealer,you need to have the tail of the tape so it ends facing away from the start of the thread.to picture this you start winding the tape from the top of the thread(or the end of the thread furthest from the start point).when you cut or break the tape the end should be positioned so when you start screwing on the tap it pushes the tape end in the direction of the turn of the tap instead of against the wind,causing the scrunch.also terminate the tape below the leve