Dollar Tree - the one that I go to - has 3 packs of the gel type for $1. It works for me! I normally dry the coral bottom on a cloth, and then add the glue, and then, while holding it in place, I submerge the whole thing for 30 seconds in tank water. It dries better under water, and also lessens the burning effect of the glue on the coral, I have been told.
David