Agree, Omnicrom is just another cromoly alloy, so use whatever you have been using, LFB, Fillet Pro, SIF No. 39, Nickel Bronze etc will do the job. Matthew Sowter of Saffron replied that he uses SIF No. 39 (Ag 38%, CU 32%, Zn 28%, Sn 2%) on all his stainless steel frames (XCR, 953). So the filler specs on some of the Saffron XCR frames is meant to say 38% silver instead of 33%. From my experience SIF No. 39 is far more usable than Fillet Pro. It will be interesting to see what silver filler Vinzenzo Forgione uses.