I've used most of the snake oils for "tanning velvet" and they tend to be just that - snake oil. When I hear the word "velvet" the only response is "freeze dry". If antlers are hard horned, then that's another thing as freeze drying isn't going to do much for that. If you want the cheap way out, put the antlers in a frost free freezer and leave them for about 6 months (redneck freeze drying at its best - and yes, I've done them that way). I've saved caribou antlers by injecting about a quart of Touchstone 4in1 into them and spraying them every day for a week.
Thats funny George I have heard that before but with birds. Mount inject them to plump everything up and put in the freeze and forget about them. for a few months.
I know I should freeze dry them and that maybe what I end up doing with them. but was just looking for some other options / ideas on doing them in house.