[Jakegr]

I have tried TLF, Deltec, Tunze coral fix and coral flex, Vertex and Instant Ocean holdfast over the last year. By far the best is Vertex V-colla. It is also pretty cheap to. Didn't see a major difference between TLF, IO, and Deltec. Tunze coral fix was horrible. It stopped skimmate production for a day and clouded up the water. Tunze coral flex is pretty good, but it costs about twice as much as Vertex v-colla.

Overall, I would say they all suck... But v-colla is the least worst of the group. There is definitely room in the market for a sticky, fast hardening, under water epoxy.