Beadman, My horn bow experience is still limited, but I, too, have had successful bows with Hide Glue and Epoxy, so I'll second you on that. The one korean bow that delaminated on me delam'd at the horn / core interface but the glue showed no signs of cracks. It was a rather thick glue line ( as is typical of Korean bows) so I don't think sinew glue is very prone to cracking. Surface prep to remove all contaminates is (in my opinion) more important.
Ron