So we are talking about a chattahoochee type stone application???
Mike is correct in that the epoxy components must be mixed thoroughly and according to the instructions. Usually for not less than two full minutes. Then the rock is added and mixed thoroughly again usually for about four full minutes. I have installed acres of that type of rock-covering but don't know if we are talking about the same type product. Mine was always a commercial-grade system supplied in bulk form.
If the mix remains sticky after twenty-four hours it wasn't mixed thoroughly and may never dry. It is pure resin. There also wouldn't be any reason to have loose stones if the batch was mixed thoroughly.
The company I used to install for finally went out of business due to too many claims against the performance of the product. Just depends where you are. In the southern U.S. the product seems to work pretty good except for the sun deteriorating it over a short time. Those products must also be resealed with a sun screen annually to survive sun erosion and ambering.