Raptor-Liner uses a catalyst and is sprayed with a Shutz gun. My son sprayed it - two coats, I believe. Some kits come with the Shutz gun. A paint/body guy I know recommended laying a black base coat first to ensure color didn't show through anywhere. Don't know if it's really necessary but we did it anyway with black epoxy.

We really like the look of it and would use it again.