Originally Posted by JJ-MIK
That sounds like a great idea.. Can you send me a supply list or website to go to? I'm very interested!
I only used 2 things to make it. Made it very porous and secure.
1) Portland Cement (grey or white doesn't rly matter)
2) Water Softer Salt (small crystal sized)
3) Play Sand (50lbs should be enough)
Got both of these at Home depot. What I did was used a drinking cup for measurements. There isn't really a perfect way of making it, so what I did was scooped about 3-4 full cups of Portland cement and about 6 cups of salt. It all depends on how much rock you want to make. Next I mixed these two together with a small shovel. Once it's all dispersed, you add small quantities of water at a time. Add 1/3 of of volume of the cup into the mixture and then mix it. Water is the main thing you need to concentrate on because too much of it and your whole mixture is ruined. You want to add enough water that the cement/salt is only damp. If it's all gooey, you'll have ugly rocks at the end. When I was done mixing the water with the salt/cement I made little shapes in a big bucket containing the sand. Then I laid out the cement mixture into the shapes slowly. Thaw about it. Wait 24 hrs and then start curing it.