Soft Rock

[MikeB]

I've been reading "The Scenery Handbook" by Peter Marriott and published by BRM in 2011. It mentions a product called Soft Rock that can be used to make model rocks etc, like plaster, but with the difference that it becomes soft again when wetted and so can then be cut and reshaped.  This sounds very useful for making scenery that covers baseboard joins that may need separating from time to time. However, the supplier is given in the book as The Model Landscape Company but this company no longer exists.  I can find no other reference to this product,  Does anybody know what it is  and if it is still available and from where?  Has anybody used it?  Thanks