I'm going to venture that you used polyester resin ( smells really bad and uses MEKP as a hardener ). If so most polyester resins contain wax that comes up to the surface when curing. Failure to remove the wax between coats will create adhesion issues. I'm afraid that if I am correct in what you used, the only fix is to remove what has been applied and start over. First step though is to verify what product it is that you used.