Here's what's worked for me over the years.
If you want to properly preserve velvet antlers IN THE FIELD, you will have to inject & brush them with formaldehyde and/or some of the new less toxic chemicals (4 in 1 solution works great). I personally don't like Velvet Tan, as it didn't work as well as other solutions I've mentioned. I was taught this technique by a very respected taxidermist whose specialty was velvet antlers.
First, with a razor blade, make very small incisions at the tips of all points (less than 1/8"). Hang the antlers upside down, allowing the blood to drain. Starting at the bases inject the solution into the veins (you'll see and feel them) that follow the antler. You will begin to see the solution "push" out blood towards the tips. Continue injecting the solution as you work the untreated blood towards the tips. When you reach the ends, make sure you've treated ALL the veins on each antlers. You'll quit injecting solution when the color of the solution is the same coming out as it was going in.
Allow the antlers to hang upside down overnight. After the solution/blood has stopped dripping out the ends, use a very fine painters brush and lightly brush the velvet with the solution. This will prevent bugs from entering the velvet that has no blood. After allowing to dry, lightly "brush" out the velvet to give it the natural uniform look. Remember, wear eye protection and gloves when using formaldehyde or any other chemicals. Slow down and don't be in a hurry to finish. If done correctly, your trophy will last forever.
This of course should only be done if you're in the back country and have no way of freezing the antlers or getting them to a reputable taxidermist in a timely manner. Hope it helps.
BOHNTR )))---------->