I put grey Permatex on the internal threads, both endcap threads on the tube,and even a thin brushing on the outside edges of the baffle stack (the edges that contact the tube. I don't put any on the surface of the baffles, but it gets there eventually anyway.
I think it also serves as a bit of an ablative medium and reduces my FRP somewhat, but that's just a guess.
The downside is that I get grey graphite mess on the outside of the can, and cleanup is always messy. However it always takes down easy and never locks up.