The background is made of styrofoam (from foam boxes), foam is ripped, cut into basic shape, then melted to get more realistic shapes, its then covered in a render layer, then covered in 2 coloured render (brown) layers, then other coloured cement oxide colours are mixied with water and blended in to make it more real looking. Then it is coated in 4 layers of pond sealer.

It is not exactly as it should have worked out, sealer went slightly white. But it is still inert and i actually dont mind the look.

I will be making some more soon, i'm going to try sealing with epoxy (danged expensive!)

__________________