High temperature PTFE tape is rated up to 550°F, which is 288°C. I'm wondering if it would be useful for components on the hot end to prevent oozing. Has anyone tried it?
Whether this is even potentially beneficial depends on the type of hotend you're using. With one like the Ender 3 where the PTFE tube butts all the way against the nozzle, it's not useful, and if it seems useful it means your hotend is misassembled, since filament is never supposed to make contact with the top of the threads.
For an all metal hotend with flaws in the mating surfaces, it's plausible that it might help, but it rather defeats the purpose of having all metal (high temp).