The present disclosure includes a method for coating a vehicle body-in-white (BIW) in a tank of processing fluid. In one form, the method includes lowering the vehicle BIW in a tank of processing fluid, rotating the vehicle BIW around its lateral axis until the vehicle BIW is completely submerged in the processing fluid, and simultaneously conveying the vehicle BIW along a longitudinal axis of the tank while rotating the vehicle BIW around its longitudinal axis in a “corkscrew” type movement.