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.
Related Honey oil is a specific type of hash oil produced by certain solvents, most commonly butane, and isopropanol. Sometimes called butane hash oil or BHO, or simply  oil , it can range in color from a bright yellowish gold to a dark amber, viscous liquid made by solvent extraction of cannabis resin.arious terms are used to denote the solvent extract of cannabis. Typical terms are hash/hashish oil, honey oil, ____ oil or ____ honey oil (where ____ denotes the solvent), and many variations on these terms. The descriptor honey is often used in naming these extracts.