Sounds a bit wacky I know, but maybe the water temperature is greater than the air temp, causing the air to expand in the lure, lifting the coating. Also consider the atmosphere and temp that the lure was originally sealed in- was it very cold/ humid etc. I have never made 'foamies', but with the heat extremes here (-5c winter to 40c summer) it is sometimes a problem with wood as well, especially balsa. The top coat may be a problem also, DN is tough and relative to D2T is soft/pliable and takes a long time to cure, I have never used some of the rod finishing type top coats on lures, but they are soft/pliable as well. Whatever, it seems to be expansion/ contraction, the old suck and blow problem. Have a look at your primer, peel the blister off, is it bonding to the foam properly? Hope this is of some help. pete