Pat B my wife gave me the thin cloth backing.May be silk. I,m not sure.I applied it with Tb 3, painted it,and used Shellac ,and poly for finish, because it is sinew backed with hide glue.DC,Brad,Slimbob ,and Bob B. when I get the thumbs up from you guys I know I,m headed in the right direction.The belly of the bow was heat treated.I got 4 bows from that log. The other bows are self bows 62 inches long ,and give or take 45 lbs. at 26 inches. It was laying along side the road. Power Co. cut it down.I had to quarter it right were it laid so I could load it on my truck.Good find.