Predator Skulls for necklace

I am putting together a necklace for my Predator. I am getting some mink and muskrat skulls. Is there a fixative ot covering that it recommended for preserving these things? Painting ideas?
 

Silent

Unblooded
I am putting together a necklace for my Predator. I am getting some mink and muskrat skulls. Is there a fixative ot covering that it recommended for preserving these things? Painting ideas?
I use a poly-urathaine dip.I just tie a string to the skull,submerge it,for just a moment(till there is no more air bubbles comming out of the skull,rib,vertabrea,jaw bone ect).Then let the excess drain off for about a day(this gives the poly-urathaine time to set).The bones will have a slightly yellowish wet look.
 
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