Brownstuff sets a lot harder than the typical soft floppy greenstuff while still capturing enough detail to render fine pieces such as power armour pipes (if you use it to cast a couple backpacks or something). Doesn't go quite as soft when working with it, however it dries much harder and is actually magnetic when dry, which is great.

Great stuff! Easily mixable into a soft, pliable putty for use as a filler or to make custom parts. It can be smoothed over with a moistened finger to remove any fingerprints, to a glossy finish. Cures into a strong, almost rock hard material that can be sanded and painted. This is an invaluable item in the model-makers toolbox, and I'll certainly be buying it again.