It's my understanding that a clear coat on top of Plastidip is to make it easier to clean. Dirt then less likely to adhere to it's surface.
And the more coats of Plastidip used, makes it easier to peel off when you want to remove it...thicker paint is easier to remove than thin paint.
Plastidip enhancers on this page:
https://plastidip.com/our-products/p...hy-dull-finish