Mid-pipe leak +permatex copper

I put permatex between my fmf header and yosh slip....also had the header machined so that it fits tight...ran great for 1000miles

i noticed this morning that the permatex seal had holes in it, and out of the holes there is soot. So i take it that the back pressure in the mid-pipe ruptured the permatex seal. that in turn means there is a small air leak at that level

Would that make it run lean? or cause and increase in off-wot idle popping?

Any suggestions on how to best remove the permatex and reapply it?

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