Teresa, I do not have any expertise in this area or with spurr/epoxy. 
     HTC "Boneheads" please take a minute to comment with ideas or a good 
     reference book that you have used. Teresa, I will check the HTC and 
     VIR directories for possible contacts.
     
     
     Vicki Kalscheur
     School of Veterinary Medicine
     2015 Linden Drive West
     University of WI - Madison, WI  53706-1102
     
     (608) 262-8534     Fax (608) 263-7930      
     
     kalschev@svm.vetmed.wisc.edu