I purchased sound a sound deadener kit along with new carpet for my 62 Nova through YearOne. The sound deadener consists of precut mats that look and smell like asphalt. One side has a thin film like paper. The other is a heavy black paper. Neither side peels off. How are these installed? Do you use a heat gun to melt the asphalt like substance so it seeps through the film like surface? Any help will be appreciated.