I have been using reptile prime for about 6 months for my ball python and for my milk snake with no issue. This is hands down my favorite bedding. It holds the humidity great for my bp and holds the tunnels great for my milk snake. I put down a paper towel before I feed my ball python and I dry the rat pretty thoroughly after thawing it. There was one occasion where she drug the rat off of the paper towel and it did get a little bit of substrate stuck to it, but she worked it out of the corner of her mouth no problem, which was way better than the struggles we used to have with zoo med Forest Floor. I used to have to help her get wood chips out of her mouth after every meal because the stuff always seemed to stick the the prey item no matter how dry I got it. The Reptile Prime is pretty finely ground, but not as fine as something like eco earth. This has meant that any time is has gotten in my girls’ mouths, they’ve been able to work it out themselves no problem and if they do swallow a little, I’m not concerned with their ability to pass it. If the rat is mostly dry, I don’t think you’re going to run into any problems.