OldFart

I do it a little different than cayugad - I guess I have another theory on all of this.... I do not use any grease - I personally think it is a gooy mess. I tried it for awhile but I ended up shooting grease up in the barrel even sometimes felt I was contaminating some of the powder loads. I use teflon tape, either white or pink, depending on how tight yourbreech plug might be. I also tighten the teflon covered breechplug face up against the mating surface in the barrel. By tighten I mean hand snug compressing the teflon but not crushing it or tearing it. I believe it is important to stop the blowback and gasses on the face of the BP not the threads. With this system I am able to shoot a whole range session without doing anything with my breech plug till I get home.

This system works for me, but it did take me awhile to learn how to do thisand to gain the the trust - NOBODY wants a stuck BP -

Good luck in however you decide to seal your BP but until you are confident check it as cayugad suggested...