As the second functional layer in automotive paint, the filler optically covers the cathodic dip base coat. As the name implies, fillers have the task of evening out rough spots and must be grindable in case their surface has to be smoothed. As the intermediate layer between the cathodic dip coating and the top coat, the filler is also excellent protection against stone chipping and provides the cathodic dip base coat adequate protection from UV radiation.
Mixing and De-Aerating