I feed about half of my collection F/T and I have never really had an issue. I have always thawed rats by putting them in a sandwich baggy and then placing them in a bowl of hot water. I used to buy from one supplier but the rats would always explode no matter what. It was gross. So I decided to switch to someone different and had much better results. The rats stopped exploding, for the most part. I would have one here or there but never like the first supplier. That was really bad. The issue I am having now is (after a year with my new supplier) the rats are again exploding. Only small to mediums are. Pup rats are fine... they stay in tact. Am I thawing them out wrong? Is there a better way of doing this or is there something wrong with my rats?