Rapid Prototyping involved creating a working model of various parts of the system at a very early stage, after a relatively short investigation. The method used in building it is usually quite informal, the most important factor being the speed with which the model is provided.
There are water-and solvent-based -- also called oil-based -- polyurethane varnishes. Water-based polyurethanes are more environmentally friendly and safer to use than solvent-based, but they are not as resistant to wear and tear as solvent-based products.
Varathane Â® Water-based Floor Polyurethane is an acrylic polyurethane designed enhance the natural beauty of wood while providing excellent scratch and stain resistance. It is ideal for all interior stained, bare, or painted projects such as furniture, doors, cabinets, and trim.