Homemade Concrete Formula for Artificial Rock TheBump
Homemade Concrete Formula for Artificial Rock ... Mix 1 part sand, 1 part cement and 1 part peatmoss or composted bark, and then mix in water, to make hypertufa that resembles limestone. Mix 5 parts sand, 2 parts cement and 3 parts peatmoss or composted bark for hypertufa that resembles sandstone. Add water and mix.