The mils seem awful perfect to me and I do realize the same paint sold overseas may be a different formula then sold in USA.
Only best half guess I can come up with is either you are applying the Deltron to soon over the fresh epoxy (best choice)
Or you are miss-activating the epoxy (even so, unlikely to cause this problem)
Other isolated things that could cause problems like this.
Dried acid film under epoxy.
Cheap wax and grease remover used before epoxy.
Wax and grease remover used and not dry before applying epoxy.
Epoxy applied over metal treatments.
Epoxy applied over rust converters or encapsulates.
If none apply, with what little info we have here I still think paint applied to epoxy to soon.