This seems like a really silly question to ask, but will Bess Maid Dry Preserve repel bugs?
Picked up a nice freeze dryer and the taxidermist I got it from was vehement about the bug problem you can run into with freeze drying. Came with a bunch of paperwork, there is a recipe in here for what they used as a preservative but I'm having trouble finding it. I do recall the use of Borax and denatured alcohol, though.
This freeze drying booklet from 1987 tells you to use Edolan-U.
Been going through all the archives and search results I can find on freeze drying but this question hasn't been answered yet