Hey Ryan,
Nice Art Rock. :thumbsup2:
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Here is my idea for your rock making. Get some material that is water soluble and press it into the cement. Maybe when it's been in the water a while you will be left with holes in the rock?
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I have used a plaster called Hydra Cal in crafts. Maby try mixing some up leting it harden then breakit up. Mix ur concrete mix well then add the chunks in after ur initial forming. If you just press em in they should hold up for hardening. Wash out with hose nossel.
As far as i Know the main ingrediant is a dry wall type gypsum product. Harmfull ???
It does disolve after its hardened.
note it cant harden twice. no recyclin