Probably appliance epoxy would be the best choice. Just scuff with a
painter's Scotchbrite pad (get it at the auto parts store, not the
cleaning section of the hardware store) then spray prime any bare
metal, and have at it. Windex makes a great wipe down, although using
a lint free rag is key. (I like flour sack material if you don't have
real tack cloths.)
I specifically didn't recommend that because I used some to repaint a
vent grille on an old gas stove (downdraft vent in middle of cooking
surface) and it wore off very quickly (as in, within a few months I
might as well have done nothing;) I can't see that black paint rubbing
off on your clean laundry would be a desirable thing. Maybe some
white VHT header paint would be acceptable though? I'm thinking that
the original paint was probably appliance epoxy to begin with, or
maybe powder coat, not any super high temp stuff.
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