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Join Date: Apr 2006
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Concentric hairlines, as in circles, more or less?
I'd guess that means blisters were filled, and the fillings were popping out, or at least, the fillings and coverings over them were expanding/contracting at different rates. I hate to say it, but if the budget at all allows, yeah, I'd want to strip it down and find out what the root problem was. If there aren't many of them, maybe just grind down each one, fill and fix locally.
Because covering it up will just be a stopgap measure at best. Could just be some patches were rushed or mixed poorly and didn't cure properly, could mean you need more work.
Was there any warranty? Or can you contact the folks who did the job?