The McKee's 37 Tire Coating Kit XL is the easiest way to apply McKee's 37 Tire Coating to your tires because it includes EVERYTHING you need for proper application. McKee's 37 Tire Coating is a semi-permanent, resin-based coating that forms a durable, flexible shell of protection on your tires. In order for the tire coating to properly bond, the surface MUST be properly cleaned using the specialized tire cleaner and brushes in this kit. Purchasing the McKee's 37 Tire Coating Kit XL saves you money and ensures success.