Bud,
Not sure whose rock moulds you have, but did you follow their directions? Usually some sort of release is required (light coating of vegetable oil, or sometimes a dusting of dry plaster before pouring - check your product).
The other key to getting the rocks out and onto the layout is to remove them before they are fully set. This way they are bendable and can be formed to the underlying structure, and can also be touched up with a dull blade or other "carving" tool.
You can also wait until they are solid, and apply them like ceramic tile, by buttering the backs with a generous amount of plaster.
Hope that helps.
Andrew
Not sure whose rock moulds you have, but did you follow their directions? Usually some sort of release is required (light coating of vegetable oil, or sometimes a dusting of dry plaster before pouring - check your product).
The other key to getting the rocks out and onto the layout is to remove them before they are fully set. This way they are bendable and can be formed to the underlying structure, and can also be touched up with a dull blade or other "carving" tool.
You can also wait until they are solid, and apply them like ceramic tile, by buttering the backs with a generous amount of plaster.
Hope that helps.
Andrew