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Re: Crimp terminal options
Liquid Lectric works very nicely, if you build up some coats. Of course you can use butyl or silicone tape, either self-seals and requires no heat or drying time.
There are also heat shrink guns with heat shields that wrap behind the tube, to reflect heat back. And anyplace that sells plumbing supplies should sell handy heat shields (they used to be asbestos) that you stick behind a copper pipe before torch soldering in the walls.
Or, you do osmething ugly, just use a good crimp terminal and shoot in some silicone grease before you make the crimp. I know, that's illegal in some views of the universe, but it seems to work Real Damn Well.