I have Pergo and can tell you that it does not stain. However, as far as seepage is concerned - if water, urine or the like, is to sit on the flooring for any length of time, at a seam, then you can find what looks like a frost heave. I have not had this problem from the ferrets, but did have this issue with a feral dog that insisted on using the middle of the floor for her midnight 'pee'. Other than that the stuff is probably the best thing I ever did for myself!! TJ Trudy Jo Wallach Shelter Operator and Foster Network Coordinator Massachusetts Ferret Friends Shelter & Rescue [Posted in FML issue 5325]