3M? Super Duty Rubbing Compound aggressively removes heavy scratches, marks and oxidation from aluminum and gelcoats, ideal for boats and watercraft. It can be applied by hand or using a rotary polisher, and requires only medium pressure to achieve a smooth, consistent finish ready for polishing. This heavy-cut compound stays wet for a long time, so you can cover more surface without having to reapply it. Economical liquid compound delivers a high rate of cut Compound removes 1000 and finer sand scratches Removes oxidation Formula remains wet for a long time and continues to cut with medium pressure Compound may be applied by hand or machine For industrial/occupational use only. Not for consumer sale or use.