I'm much of a novice on model railroads. Currently, I want to do roads easily with accessible materials. My location is in Quezon City, the Philippines, and there are no model railroad shops here. It is of my current interest to use plaster of paris for the roads. Can this be done? How do I do it, from how much water to be mixed per part, to how could I color the plaster? Are there other materials that can be used as well? Should there be other materials, they should be available here. Sorry for the parameters.