Be aware, it's easier said than done. Have to hold it in place to allow the glue to set. Gets all over my fingers, which is a major pain, so I started wearing surgical gloves when I do it. Sometimes, the stuff just does not set no matter what you do. Or it takes too long to set, b/c your glob was too big, or there's a layer of crud that was on the rock and you just tried to glue to the crud, which of course, comes right off the rock and sticks to the glue, which by now has hardened......
then again the epoxy putty is no joy either. It has no adhesiveness worth speaking of so when it hardens, if it's not wedged in, it ain't staying put.
I get so frustrated that I now let my GF do it.