I know this has been covered, But since I was in the middle of doing one anyway, Figured I would cover it again.
How to do a skull!
I have only done this on coyote and fox skulls, but it should work for anything. Skin out the skull and remove as much meat as possible. Also remove the eye's and toung. Place in a bucket and cover with a good amount of water. Now add some baking soda. I use about 2 LBS for a coyote or fox. Probably could use more for bigger skulls( maybe 3-4 lbs.). Let this sit for about 6 weeks. Make sure the skull never gets exposed to the air, keep it covered with water. After the six weeks , remove the water and hose down with a high pressure nozzle on your garden hose inside the bucket. Make sure to spray inside the brain cavity. Next put it in a big pot with just enough water to cover it and boil it for 30-45 minutes. Just a slow rolling boil. Make sure the pot is big enough so it wont boil over if it foams up. After boiling, drain the water and hit it again with a high pressure nozzle in the pot or bucket. BE CAREFULL NOT TO LOOSE ANY TEETH. All the teeth will fall out and the bottom jaw will split in 2. After cleaning the skull and teeth of any left over material, I place it in a zip lock bag with hydrogen peroxide bought from the grocery store. Completely cover it and let sit for atleast 30 minutes. Remove all the parts and let dry. Glue the jaw back together ( i use super glue or a hot glue gun) and then figure out the puzzle of where all the teeth go and glue them back in ( I use super glue). Now coat with several coats of gloss clear paint. I spray the top half and bottom half seperatly so they wont stick to each other when you set them together.

Here is what it looks like after boiling and letting soak in peroxide.


And here is what it looks like after reassembly and a couple coats of paint.

_________________________
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Remember, if you're not pissing off a liberal......You are one!
Ted Nugent