Thanks for the reply.
I also have heat shields, for the exhaust pipe.
I will be adding heat shields above the transfer case as well.
I sprayed the interior van floor, walls and doors.
I am very happy with the Lizard Skin applied in my van!
I may use the remaing product and spray the underside of the rear floor.
There are attachment parts for the spray gun, one is like a capital L, and one is for a smaller hose to clamp on, for hard to reach places.
Overspray is not an issue, just use the low volume setting.
Here is the link for the spray gun, click around and see what you find.
Let me know if you have more questions, and if you apply the Lizard Skin.