Kevin from GTA in detail told me if you had an opticoated car next to a waxed car or a car coated with a sealant such as Wolfgang side-by-side, you wouldn't be able to tell the difference. However, if you had any waxed or Opticoated car beside a car coated with C-Quartz, the difference between the two is like night and day, extemely noticeable, no comparison.