I'm trying to replace outside faucet, but can't get old one off. Is there anyway I can break the teflon tape bond on the old faucet?

"teflon tape bond" isn't the problem.

Heat from a torch is the best tool for taking a joint apart.

So I heat the faucet?



Edited 1 times.

A "teflon bond" would make the faucet easier to remove, not harder. You need a bigger wrench.

... or a torch if (improperly) soldered in place

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

You heat the joint. Some old corroded threaded joints need an extreme amount of force to take apart. Heat will lessen the force required.

Use two wrenches - one on the pipe to hold back and one on the valve to turn. This will give better leverage and help hold things straight. A lot of force applied crookedly can bust things you don't want to bust. If that doesn't work heat the valve and try again &/or get bigger wrenches.

Teflon Tape, is not the issue. Teflon Tape actually helps in breaking the threads on your faucet. Your issue is related to rust, minerals and age. Heat, properly applied, should break that bond and allow the faucet to be removed. Make sure that you apply new/fresh teflon tape when you installed your new faucet. I hope your new faucet is equipped with a vacuum breaker.

Best Wishes