Hey, I am thinking about using Sludge and Spray in my car instead of more Mat. I have an air compressor so I could set up a spray gun and do it that way. I was thinking of putting sludge in the doors, and some of the trunk, and then spray over the rest of the car. Then putting Overkill over that. I already have a layer of Brown Bread over most of the car. Does this sound good? And are there any discounts anyone knows about?