Most of the foam and plywood terrain is now covered with Sculptamold plaster, and the roads and river base are covered with Durham's Rock Hard Water Putty (the yellowish color). Durham's woks well for roadways with a finer texture than the Sculptamold, and will be sanded to remove any putty knife marks. I also use it for the base of water features because, well, it's water proof. The epoxy resin I'll be pouring for the river is very thin, and like water, will find any pin hole leaks before it cures. I've caulked where the foam meets the plywood base, and the Water Putty adds another layer of leak protection. This all has to set up now for about a week before continuing on.
