Re: Borax Question
I used to air dry Muskrat & Fox hides on fur stretchers in about 3-4 days in my basement. Thicker hides such as Beavers took about a week. As long as most of the fat is removed, they dry rather quickly in a warm environment.
The Borax absorbs moisture, so you should be good. There still may be oils on the feathers, which is natural. A light cleaning with a degreasing dish detergent will remove the oils, but that can be done prior to tying with the feathers. It will also remove any dirt that may be present, since most birds like to dust themselves. The dirt is what really attracts vermin, so cleaning any fur or feather item is always a good idea. ( Except maybe CDC or Snow Shoe rabbit feet, as the oils is what gives them their floating properties.)
Placing the feathers & hide in a freezer will also help dry up any remaining moisture. Place it in a bag, to keep the borax from getting all over the place & it will be fine.