Cutting compound

A cutting compound is an abrasive liquid or paste polish designed to remove a very thin layer of clear coat evenly across a panel. Rather than filling in a scratch, it levels the surrounding paint down to the depth of lighter scratches and swirl marks, so they disappear because the damaged layer is gone, not hidden.

This matters because most paint defects, like swirl marks, light scratches and water spot etching, only sit in the outer few microns of clear coat. A compound with the right abrasive level removes just enough material to erase that damage without removing so much that it risks going through the clear coat, which is why compounds are graded by cut strength from heavy to light.

Pair a compound with the right pad for its aggressiveness, and always follow a cutting step with a finer finishing polish to remove the fine haze the compound itself leaves behind. Look for products that state whether they work well by hand or specifically need machine application. A common mistake is reaching for the heaviest compound available for every defect, which removes more clear coat than needed when a lighter compound would have worked just as well.