Black tail head project...advice?

I figured I'd ask for some advice before I destroy another sculpted head. I made another blacktail head last year a little larger than this one, that in the end turned out well but I think I took the tough route getting there. I'm almost finished up with the sculpting, just need to refine it down a bit and do a little more tweaking. I was just curious if anyone had any suggestions on materials and tequniques from here forward. I had issues last time with sealing the clay, and getting a clean mold that picked up good detail...I'm not very well versed with fiberglass. I ended up last time doing a lot of clean up to the fiberglass mold to make a nice finished head. Anyways, any advice will be greatly appreciated.

 

Thank you Ted, good stuff