Clean off as much flesh and hide, brain matter, eyes, etc. the best you can. Makes the process easier.
Lightly boil the skull. A long hard boil seems to make the bones more brittle.
Carefully clean off the cooked meat. I boiled a second time and got more off the skull and nasal cavity. Save the teeth as the loosen and will fall out. Glue on later.
When you have the skull as clean as possible, I air dried it for several days.
Go to a hair salon supplier and buy a package of 40% peroxide/whitener. Used for hair only.
The 3% in the brown bottle in the drug store isn't strong enough..
Mix the paste up and paint the skull, let dry over night and rinse off. If you want it whiter, do it again.
Cost of the 40% peroxide/whitener was about 10.00 last year.
My finish was a clear satin finish lacquer that I lightly sprayed on only to seal the finished skull.
Did my son's buck last year.
Bowhunter.. You can always pay somebody to do it for you BUT for the couple bucks and the time and effort you will be rewarded with the satisfaction of doing it yourself!