How to Confirm If the Primer Paint is Damaged?

[Murphy]

To confirm if the primer paint is damaged, you can use your fingernail to scrape over the scratch and feel for any indentation. If the scratch can catch the sliding of your fingernail, it indicates that the scratch is relatively deep and may have reached the primer paint. If you only feel a slightly rough indentation that isn't particularly deep, you can use a polishing wheel along with a polishing enhancer to remove the oxidized layer attached to the car's surface and smooth out the fine scratches. At the same time, the polishing agent penetrates the paint, causing a restorative change that refreshes the paint surface. Tips for repairing minor scratches: First, check the extent of the scratch. If it's just a very shallow surface scratch, immediately treat it with a compound. Wipe in a straight line, and once the scratch disappears, use a finer compound to wipe again, then apply wax.