It does not seem to be stainless if it rusts! I guess the easiest fix is to sand it down again and treat it to a spray can paint job, maybe followed by some shelving contact paper to look like wood grain if the rest of the dash is woodgrained. Real stainless steel will not corrode/rust and can be buffed/polished to a shine that will last.

Don Shillady
Retired Scientist/teen rodder