you don't need to go to metal. you need to remove the bad/oxidized clear.
and as far as the "thin the living hell out of the rustoleum and waste 8 days rolling it on/wetsanding between coats" paintjobs, damn people big lots or harbor freight have $30 spray guns and it cuts the time involved in actually putting on the paint from a week to half a day. you'd spend more money on sandpaper to wetsand all the rolled on coats than to buy a cheap HVLP gun and some 1x2's and plastic to build a temporary paint booth.
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