What are the advantages and disadvantages of the urethan coating?

Although urethan coating provides excellent wood and metal protection, it is not always the best choice for the target coat. Urethane, or more appropriately, polyurethane, is an artificial polymer, and although its impact resistance exceeds the resistance of the paint and shellac, it does not penetrate the wood in the same way and remains on the surface. The urethan coating emerges well on the metal state and will follow any previous surface, but its plastic appearance may be displeasure. Although it is usually affordable, Urethane is not available at least expensive surface material.

While lacquer and shellac, which are natural polymers, hardens the evaporation of the solvent in which they are carried, must cure the urethane coating. As the solvent evaporates, the polymers are formed by responding with chemicals in color or with moisture in the air. The final surface is more resistant and resistant than the surface created by natural polymers, but the waiting time between consecutive coats is longer. The dependence on the curing process can be this period anywhere fromTwo hours within two days, and until the completion is completed, the surface cannot be grinded and must be protected from dust.

polyurethane polymer is designed to provide higher chemical resistance than natural polymers. For this reason, the urethane coating is much less vulnerable to spotting or coloring than other coatings, making it a better choice than a varnish for boards and bars where leaks are frequent. It has a higher impact resistance, so it is also less likely to be brought to the abuse that suffers from these surfaces. Improved chemical and impact resistance makes urethan an efficient car treatment, but its use correctly requires care because it does not flow from the spray gun as easily as varnish or enamel. In addition, the toxicity of the ingredients in the car urethan requires the use of expensive clothing, glasses and respirator connected to the air pump.

Uretan products that lzE are available for wood -based painting, are available in oil -based varieties and water. Unlike urethane products for the use of cars, the waterproof wood is non -toxic and the vapors that produce, can be safely breathed. Excellent impact resistance and longevity of polyurethane surfaces based on oil or water causes them to be suitable for floors, although the plastic appearance of the urethane coating could reduce the appearance of certain varieties of wood, especially dense exotic hardwoods such as teak and mahogany. These forests could look better if they remain unfinished or simply covered with oil.