just poly blend sanded grout and rocks. First i set the base with rocks and filled the gaps with grout. I let that set and dry for 12hrs before i started the sides. I let each side set for an hr or so depending how dry it was then added the next row. I also would use a moist paintbrush to smooth out the grout and WAX PAPER is your best friend...I had no problems with it drying to my project. Also the brush works great to keep the grout in the gaps and letting the rocks show.
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