I'm pretty sure that U.S. Gypsum sells a similar product. It's meant for patching holes and large gouges in drywall and plaster. It's no good for taping or screwheads, though, because it's difficult to sand when cured. The Durabond sold here has various numbers after the name: Durabond 60 sets in 60 minutes, and so on. The hardness is particularily important for doing "water" with waves, as it's less likely that the high points will be accidently knocked off. Here, it's sold in one and five pound boxes, or in 33 pound bags. About $20.00 for the bag the last time I bought some. Btw, I used the same stuff to make the bridge piers and abutments, using simple styrene moulds. :thumb:
Wayne