At it again; needing help. I've formed the hills and mountaiins with hydrocal and plaster with pretty good satisfaction. The portals and waterfall areas came out good but I'm unable to develop the technique for rock and strata details. Could I add agrigate (crushed concrete or crusthed rock) to the plaster to get the rough finish? Any tips would be helpful...Thanks, Jim P.S. I have rock molds and will use them but my layout is too large for precasting all the rocks plus in lots of areas didn't allow sufficient depth for the molded rocks.