Problem with primer on chassis

[Andy_B]

Has anybody seen this before ? Have been having a wee test with my metal primer..Dulux Metalshield in grey ...i painted a bit over the front frame last night and when i went out this morning there was brownish blotches that looked as if it has come through the primer...especially bad around the welds...now i did give the rails a good polish with flappy disk and a final wipe down with acetone so i thought it would be contaminant free....the paint has been in the garage for the last few months could it be gubbed due to extream cold ?? would be pi$$ed off cause it cost me a few quid and unused