Truck bedliner, or simply Bedliner, is a protector applied or installed into a truck bed. It can be used to protect the bed of the truck from impact and abrasive damage. There are two broad classifications of bedliners: "Drop-in" and "Spray-on/in". "Drop-in" bedliners are installed into a truck bed with limited preparation work, and are removable for cleaning. Spray-in bedliners require specific preparation to allow the coating to adhere correctly to the bed. How well the coating adheres will determine how long it will last. History Protecting the bed of trucks has been around since the inception of the modern pick-up truck in the early 1950s with simple modifications being made such as installing planks of wood to the beds. Ford's F100 series featured such options, now done only for cosmetic purposes or restoration. People have also been known to install a simple sheet of wood as a means to protect the floor from being scratched or dented. As pick-up trucks were designed to haul cargo, a more advanced method was created. Thermoforming, a technique that has been around since the 1940s in acrylics and styrene, would eventually through advances in development and research create the first plastic drop-in bedliner. In 1972, G. Fred Lorenzen filed a patent for "protective inner liner of cargo box or body of pickup truck". In 1976, Robert J. Zeffero filed a patent regarding the protection of truck beds with a "cargo box liner for pick-up trucks". In 1983, Penda Corporation along with others would soon figure out a way to replicate the design and start to manufacture their own design of a bed liner. Drop-in bedliners Drop-in or plastic bedliners are the most commonly found type, although with the spray-on bedliner industry garnered recognition, drop-ins have lost some value in market share. Drop-ins can usually be installed rather quickly with no major modification made to the bed of the truck except drilling small holes in key areas to hold it in place in certain applications. Typically made of a polyethylene composite, drop-ins are a rigid structure formed to the contours of a specific vehicle model. A newer version of a drop-in bedliner, recently introduced, is composed of separate sides and a rubber mat for the floor made by DualLiner. Spray-on bedliners "Sprayed-on","Sprayed-in","Spray-on", "Spray-in" (these terms are used interchangeably in the industry) come in varying formulations and process methods such as high or low pressure,