yup u can definitely use the epoxy glue, that is really good too, or u can also drill a hole through(or as deep as u can) the rocks and insert and fiber glass rod with the same thickness of the drilled hole they sell them a HD for about $2.00/rod approx 3ft long, u can usually find them in the section where they have the reflectors to put on driveways or on the "For Sale" signs for the houses. Just make sure u use the drill bit made for rock or masonary cause if not u'll just end up breaking the bit.