ultra cut has been designed with special abrasive mineral along with premium solvents.the abrasive mineral is designed to be very aggresive,ultra cut can be used on all surfaces,specifically heavily oxidised or contaminated.ultra cut to clean and de scale the surface then combine pro red when used by hand on a alpha polishing disc or with a dual action buff .ultra cut gives you the option to get a great result even if you dont use airway buffs and compound bars.