Look up your nearest roofing supply in the yellow pages and ask for "Torch Down" roofing material. It is an asphalt/rubber material very similar to Dynamat but at a fraction of the cost and thicker. It is put down on roofs by melting the back with a propane torch. It comes in small rolls for repairs and flashings. About 1/8 thick. Larger rolls come with or w/o granules. The small rolls are w/o . Buy w/o granules. Just put it down or melt the back with a propane torch to make it stick. The spray bottle stuff is not heavy enough and doesn't work as good.