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  • What sound technique would reliably eliminate obstruction at the joint and downstream? You'd have to have extremely precise application. Commented Jun 8, 2022 at 18:21
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    Because doing it that way is a doping scandal :P Commented Jun 9, 2022 at 14:17
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    What would having "additional sealant" be good for? Either the threads seal properly with a nice solid metal-to-metal contact that you can rely on for decades (the pipes themselves aren't going anywhere, if it doesn't leak right from the start, it never will), or they don't. If they don't, you want to know and fix it, not rely on "additional sealing" by means of a layer of a viscous liquid which can get disturbed at any point in the future and cause your house to go boom. Commented Jun 10, 2022 at 9:10
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    Additional reason is that iron pipe often has burrs on the cut threads. Applying sealant with your fingers is a risk. You should use a brush applicator, and that is hard to do well inside the fitting, much easier to see complete cover and no drips on the outside of the pipe. Commented Jun 10, 2022 at 16:49