Since the Mongrel project has had such extensive sheetmetal work, including a complete floor and chassis swap, there are a lot of seams that need to be sealed. And because the car was blasted to bare metal and then primered, sealing up the bottom is a real priority. We’ve never personally used UPOL Raptor before, but it is a spray on bed liner type of material and should be great for sound control and undercoating and it certainly looks nice when finished. Yes the Mongrel will be a track car, but there is no doubt that a coating system like this is still a good idea that will help your project stay nice, quiet, and water tight from underneath.

Watch the video below to see how it goes on, what it is like, and how well it seems to work for the Urchfab Mongrel project.