The new Ultra Cut product from Renegade has been designed with special abrasive mineral along with premium solvents. The abrasive mineral is designed to be very aggressive, then over use break down to become finer. Ultra Cut can be used on all surfaces, specifically if they're heavily oxidized, or contaminated....We know from testing, that Ultra Cut to clean and de-scale the surface, then Renegade Pro Red are an absolute killer combination when used by hand or on our Alpha polishing discs in conjunction with a dual action buff....Ultra cut gives you an option to get a great result even if you don't use Airway buffs and compound bars.