Each different color pad indicates a specification of each step of the process to getting the results you desire. Red is for resurfacing. It removes surface stains and scratches, including acid stains. Orange is for preparation. It refines the surface for intense shine. Yellow is for polish. Using the yellow pad will achieve a matte or satin gloss. Blue is for intensify. It intensifies the surface brightness. Green is for super glossy. You use the green pad to generate a super glossy finish, the last step in the process.