So far, I have been doing cheap cyano from the dollar store..gel only. I mix a little blob of underwater epoxy, add some gel and squish it into the LR. Then I take the frag, dry the base and put a blob of glue on and push it into the epoxy. If needed, then I mold the epoxy to either the base of the frag or the LR, depending upon what is needed to make it look right and stay put. It sounds complicated but only takes a minute and is very cheap.