If it is the same as Cool-Car it is a great product. you can spray it on all the inside panels including the chicken wire and cheese cloth roof bows and all it will keep the heat out and noise down. very messy though so tape off carefully.
I have been using it for years. It is a product developed to reduce heat in NASCAR. Also does a good job on antiques and street rods. It is water base so clean up can be done with a damp rag but don't wait too long.