You could always try another method with little or no plaster. A big roll of the discount Chux cloth with diluted white glue, paint or brickies mortar colour. That way you keep the plaster where you want rocks and save the weight and cost. This method has been successfully used by a number of modellers. such as the Canberra N Scale Group on their portable exhibition layout, so it must be strong enough.This is what some of the guys at the club did on my module years ago, Chux over the top of carved/shaped white foam. (Came back one day to have it on one of my Free-mo AU modules)Cheers,
Hendo
Nice and light, can just shove trees into it and pretty resilient to knocks etc.
Saying that, naturally it soaks up EVERYTHING. You'll need a lot more glue and paint to cover it, naturally. It's kind of what Chux are good at doing, after all! 
Wolfpac
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Edited 23 Dec 2013 20:51, 8 years ago, edited by wolfpac
You could always try another method with little or no plaster. A big roll of the discount Chux cloth with diluted white glue, paint or brickies mortar colour. That way you keep the plaster where you want rocks and save the weight and cost. This method has been successfully used by a number of modellers. such as the Canberra N Scale Group on their portable exhibition layout, so it must be strong enough.This is what some of the guys at the club did on my module years ago, Chux over the top of carved/shaped white foam. (Came back one day to have it on one of my Free-mo AU modules)Cheers,
Hendo
Nice and light, can just shove trees into it and pretty resilient to knocks etc.
Wolfpac