No glycerin needed
Needs to dry all the way.
When you get ready to glue it to a bow soak it in water about 30 min., scrape the inside with a dull razor blade to remove the unwanted membrane, rinse it again. It will be as flexible as it was when you skinned it .
use a water based glue Titebond 3 and center and pet it down you run air and extra glue out.
I wash mine in dawn dish soap after skinning, then peg it to cardboard.