Truelog
Crate 350 Edelbrock 4 bbl
The only reason to top coat it is that it is UV sensitive, originally it was meant to be used on the underbody of vehicles.
Inside of a van where it will have other materials covering it (flooring, insulation, wall panelling) there is no reason to top coat.
That is what I was thinking. The Lizard Skin insulation stuff looks pretty cool though.