Fingerprints are fingerprints and you cannot change it. Your problem is hand sweating that's why when you take fingerprinting your hand sweat and no fingerprint image coming out on the new technology they are using for fingerprinting but they will send you to another place where ink is being use. So next time always bring with you a small towel or lots of tissue paper to put on your hand so the tissue/towel will absorb the sweat in your hand.