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.
Solvent Based Paint. Solvent based paints are a hard one to discuss as there are so many different systems out there on the market. By solvent based Iâm referring to the automotive paints we use for airbrushing murals, flames, graphics on bikes, cars, trucks, etc. With these the best thing to do is to get to know your local paint jobber REAL well.