Well, I had PLENTY of this stuff left over. One entire "kit" plus about half of the third roll. Better to have too much than too little, I suppose.
So I started using this barrier insulation on the cars by putting it underneath the car mats (front and rear) on the cars to see if it helps with the heat there. These cars get pretty darn hot on the floorboards and especially in the trunk, so I'm hoping this will cut down that heat considerably.
Hmm, guess I should have done a "before and after" with the temp gun.
But I guess for certain it can't make it any hotter!