This invention provides high solid paint compositions comprising as the basic components a hydroxyl-containing compound having a weight-average molecular weight of not more than 1,000 and a hydroxyl value of 200-800 mgKOHg, and a polyisocyanate compound, and a process for forming multi-layered coating film using any of said compositions. In one embodiment, the process includes the steps of placing a base web between a first moving conveyor and a second moving conveyor. The chambers include openings which are oriented generally upwardly and emerge from the waste water adjacent a top dead center position of the wheel and are oriented generally downwardly and submerged in the waste water adjacent a bottom dead center position of the wheel. After the suction cups have engaged the tread, the tread is raised from the storage device, inverted through 180 degrees, and then set onto a special slotted roller conveyor.