A guess is you are not using the right primer paint combo or doing
improperly, you have a chemical incompatibility such as a high solvent
paint. A long dry time likely would be best. Dry times are usualy rated
at 70f, 55 is pushing it for many modern paint formulas in spray , the
low temps increase cure time and the primer has not cured out and
sealed, the finish coat is eating into the primer. Call the Mnfg and be
sure you are following all instructions.