It does shrink quiet a lot as it dries so that would need to be taken into account and I have a feeling that the small reinforcing fibres may be wood fibre so maybe not good with hot metal. Also make sure there is no moisture left in the clay before you pour.
When I was more into figure modeling I often used it to create paving, cobbles and brickwork for the bases so if you are into stationary engines it could be used to make bases for them.
J
Edited By JasonB on 20/11/2012 18:52:36