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Re: How hard is it to prevent this?
First off, nothing including seam sealer, epoxy primer, paint or even snot won't stick to a dirty, oily surface. You have seams that would indicate a dirty, oily surface... at least where the coating fell off.
Secondly, rust will appear where moisture and oxygen are in the presence of bare steel. If the coating (in this case epoxy?) leaves room for moisture and oxygen, you'll get rust. Even flash rust can be contained by a good epoxy primer.
Good epoxy primer (regardless of brand 100% of the time) is NEVER UV resistant but WILL resist corrosion "creep" after a scratch or bruise... rust will appear in scratch but will NOT creep or spread.
Crappy epoxy coating combined with bad prep will result in rust as you have experienced. Perhaps it's not even epoxy??
These pictures reveal crappy epoxy from ProForm that was exposed outside for 10 days. Total crap... had to sandblast again and recoat with real epoxy.
Take it back to the shop and with a polite presentation, point out your "issues" and ask for a remedy.
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