I've tried Marineland's Epoxy, and definately do not recommend it. I too, was trying to attatch base rock, and I even let it dry overnight, and it completely fell apart the moment I nudged it. The epoxy wasn't tacky in the first place which got me wondering about its reliability, but never the less I paid $ for it, so I gave it a try, and it turned out to be the biggest waste of money I have spent to this date. After such an experience I was too deferred from buying any other brand so I have no other type of epoxy recommendations, sorry. But good luck none the less!