good response. Could also be he wet sanded, didn't clean the sludge off, then tried to rinse it off after it turned to concrete.
Or it could have been sanded, left to collect dirt in the scratches, then painted. Are we talking Urethane 2k? As Brian mentioned, technically anything with two parts is a 2k but most companies will call a Urethane Primer a 2k, but just want to be sure cause if it's an etch 2k the acids in it might be giving you trouble.