Just finished one...here is what I did.
Skinned the head out.
Sat on ant mound covered with a bucket....put a few holes in the bucket to avoid a steam bath.
Give it a couple months.
Then I submerged in my fish pond for another month...let it get covered with algae....be careful so not to loose the teeth.
Take it out and scrub it.
Bring to boil enough water to submerge it...add a cup baking soda and a cup of clorox...boil for a SHORT period of time....10 minutes...Long boiling will cause it to become brittle.
Mix together a paste of baking soda and hydrogen peroxide and cover...set in sun until dry....(couple hours)
Rinse clean
Let dry
replace all teeth and put a drop of super glue around each one...also set tusks and glue.
Let dry
Hang and spray with matte clear coat spray paint. I give it about 3 coats.
Let Dry
Glue jaw to skull (if you want it one piece)
DISPLAY
Sounds like a lot of steps, but is what I do....Turns out really nice....
I like mine a more natural bone color.....Some people spray them white....