A pencil is selected and a line about 1 2 inch long is made.
Ceramic coating scratch test.
Protect your car from scratch playing kids using ceramic coating.
After 6 months of not washing my ceramic coated m3 i decided to compare it to my porsche 911 that was ceramic coated 2 weeks ago.
If the pencil scratches the surface of the coating then a softer pencil is used until we acquire the first pencil that doesn t scratch the coating.
Here s what a 3 000 36 hour paint correction ceramic coating looks like on a 15 year old e55 amg duration.