This past weekend I had the chance to do some testing with a non-contact temp sensor on my three hot rods. I have just completed installing B-Quirt over the Lizard Skin sprayed earlier. I was a little concerned about that decision and wanted to see, before upholstery, how it performed. The outside temp was low 90's in bright sun. The car is a 1940 Ford coupe painted black. First I tested outside of an area that does not yet have B-Quiet on it [ran out]. I was shocked to find only a 5 degree difference between the outside and directly opposite on the inside. I had the Lizard Skin applied by a local shop that does so regularly. Did they not do it corectly???? Certainly looked good, but how do you ascertain 40 mils? I later decided to do the underside of the car and sprayed it myself, I don't know if I got 40 mils. I do like how the Lizard Skin seals the surface. Anyway, next I tested the area with B-Quite over the Lizard Skin. WOW, a 60 degree difference. I also tested my Blue 46 coupe with some insulation that comes from the aircraft industry [not sure of the name, black, closed cell foam type stuff] and a headliner. It was 40 degree's different. Then I tested my 53 F100 with two layers of the "jute" backed foil. I put the first layer in with the foil toward outside and then was told by many that was the wrong way, so I intalled a second layer with the foil to the inside. It has a Rod Doors ABS plastic headliner. It also tested at a 40 degree difference. Of course, what I don't know is what a effect a headliner will have on the 40, I hope for the better. I have attached some pictures to validate my comments.