Hey everyone!

Does anyone know what's the layer of rough cardboard colored stuff that's sprayed under the car is for? I scratch some of it off when jacking up my car and was wondering if that's going to hurt it. I know I'm suppose to jack the car up at the front, but I don't want to remove the big plastic cover.

I'm guessing the stuff is to prevent rust? Can i buy more of that from somewhere?

Thanks