It is "D-D aquascape aquarium expoy". I flatten it out after mixing and gently lay it over the rock, leave it for 24 hours to get hard so that it now has the basic shape of the underlying rockscape that it lays on. I then take the chalice frag and glue it with "zap" to the epoxy so that as it grows out it looks like it is growing on the rock. Eventually it covers all the epoxy but then you have to keep lifting the chalice off the rock to make sure it does not grow into the rockscape. I thought that way if I ever fragged my chalices, I could remove them from the tank. Two things I discovered, 1.) I like my chalices and dont want to trim them and 2.) chalices when they get the chance like to adhere to rockscape. I like chalices growing on rockscape and prefer that to laying on the sand (plus my wrasses like to flip anything on the sand)[h=1][/h]