I have some woodstove paint that is supposed to endure up to 1200 F. It seems to be less scratch resistant than ordinary enamel. I have only heated my 223 silencer up too much once, so it is not much of a problem. I just cover the engraving with tape to avoid painting over it. I have heard about the method of stamping that you refer to, but do not own a set of stamps.
Ranb
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