except for beaver as i have not finished beaver heat is overrated, its the humidity ya have to work with, i have put up and gotten top price for many hundreds of cats, coyotes, coon and badger and never had a drop of heat, and the temps ranged from 45 above to 10 below, butit has to be dry in the building, and open front pole barns dont stay very dry, on the other hand one can dry a buch of fleshed coon in a very short time by putting out into the high winds for 18 hours but again it has to be dry and you have to be right on them the whole time, as far as borax goes if nafa docked for it then half the furs would be rejected, i use it on green early fall yotes myself but i know plenty who rub the entire yote pelt in it and put on stretcher fur out right off the beam, cats the same way, ive also watched fellows rub it into well fleshed skunk, coon, and possum pelts while on the stretcher every day until plumb dry, i dont see the need in my area but they seem to think they do, one other thing, if you use one of those new fangled gas wall heaters that require no venting, remember that in an average day many gallons of water is coming out of that heater, it can be a very bad situation in a fur shed as the air is so thick with water even you wont stay dry after a time.