aromatic or aliphatic, polyurea or polyurethane, or hybrid and solvent base. Performance greatly relies on the initial surface preparation done on the bed. It is possible to have the color of the bedliner match that of the vehicle, but with time, color fade from ultraviolet radiation is inevitable. Aromatic is generally used for black and darker colors, and is the least expensive option. Aliphatic can be a better option for colors because its color is more stable over time in ultraviolet light. It is produced with pure polyurethane, which drives up the cost approximately 35%. Aliphatic materials can be sprayed in a wide variety of colors, including metallic finishes. Spray-on bedliners can be applied by roller, low pressure, cartridge driven by an air compressor or high pressure machine. Environmental conditions such as humidity, temperature, wind, and elevation can affect the cure process of a spray-in bedliner. Nozzle aperture, thinners, and spray pressure can be modified to allow proper distribution of the spray lining chemicals. Differences in spray-on bedliners Spray-on bedliner material can vary in texture as well as color. Texture can be smooth for easy cleaning or rough to prevent skidding. Polyurethane can be sprayed from 1/16 inch to 1/4 inches, depending on the application. Thinner coatings may cost less but can chip and crack. Thicker coatings will alter the shape and size of the truck bed somewhat. For trucks with the most rugged use, ArmorThane sets optimum thickness for bedliners as 1/4 inch on the bed and wheel wells and 1/8 inch on the sides. When applied correctly, the value of a truck bedliner is that it resists denting, scratching, and holds shape firmly, yet is flexible enough to not crack when navigating through rough terrain. Unlike a metal bed, it absorbs vibration to protect cargo. Whereas painted metal will chip and rust under rough conditions, polyurethane coatings prevent damage from scratching and from most chemicals, and therefore avoid rusting. Spray on truck bedliners require a professional applicator who has the training and experience to follow the process and deliver a smooth, even surface. The process requires sanding to create a surface for the polyurethane to attach. This allows the polyurethane to bond permanently so it will not bubble even in extreme weather. The choice of colors is virtually unlimited. A color matching system sprays to OEM specs or owners can choose custom colors. Adding an ultraviolet stabilizer maintains