Menzerna Heavy Cut Compound 400 (FG400) is an aggressive professional cutting compound. It cuts paint back quickly and easily, and is thus ideal for tackling deep scratches and severe acid etching. Unlike many cutting compounds, it also finishes down well to give a sharp, high gloss finish that, in most cases, needs only minor refining with a finishing polish afterwards. Menzerna Heavy Cut Compound 400 (FG400) uses coarse precision-milled diminishing abrasives suspended in a base of lubricating oils. Like its siblings, it contains no fillers of any kind. Although designed with scratch-resistant clearcoats in mind, it's also suitable for use on conventional hard paint finishes in situations where maximum cut is required.