The success of any plumbing project hinges largely on the quality of its joints. Threaded connections between metal or plastic parts can be particularly problematic if not sealed properly. Teflon tape and pipe dope are used to fill voids between male and female threads to make joints leakproof and to prevent metal parts from rusting together. People often use pipe dope on top of Teflon tape, but some manufacturers say there is no benefit to that usage and that Teflon tape and pipe dope perform the same whether they’re used individually or together.
