Burnout / Dark Spot - hide with dark stain, rusticate it?

[Mister Moo]

Nothing to lose.

Scrape the lose stuff out of the chamber, wipe it clean, mud it properly; wait 24-48 hours, sand the mud smooth and smoke gently a couple of times. If the mud holds for a few dozen smokes (I've never had it fail) worry about refinishing the pipe next year. Not a rustication candidate if successful.

I bought a new MM General on vacation and smoked the heck out of it on the beach and porch, constant breeze pretty much. A few weeks later it gutted, turned a large dark brown spot and burned my fingers; mudded now and five years later, I smoke it every week.