How to Fix SANDING MARKS – SINNEK

Sanding marks are a painting defect that usually occur due to an incorrect sanding and preparation of the intermediate coats. This video shows its most common causes and how to correct this paint defect.

What are sanding marks in automotive paint?

Sanding marks in paint are a set of grooves or scratches that have not been coated or filled by the paint coat. This defect usually appears below the finish.

Sandpaper marks result from too coarse sanding in the preparation areas or lack of paint filling and levelling power.

These marks appear as a result of a decreased coat thickness during the drying process.

Causes:

1. Choice of abrasive grit size

2. Preparation of the intermediate coats

3. Observing the drying times

4. Lack of layer thickness