Coarse compound for first-stage, rough-cut preparation. Removes visible scratches, pitting, rust and debris from softer metals like copper, brass and aluminium. For best results use with spiral-stitched buffing wheels to enable a powerful cutting action. Supplied in a 500g block for fuss-free application and simple storage. Apply little-and-often during use for best results.. Coarse compound for first-stage, rough-cut preparation. Removes visible scratches, pitting, rust and debris from softer metals like copper, brass and aluminium. For best results use with spiral-stitched buffing wheels to enable a powerful cutting action. Supplied in a 500g block for fuss-free application and simple storage. Apply little-and-often during use for best results..