I use gas to clean off butyl from sound deadnerI don't think the sound deadener will last very long.
Gasketing Materials - vegetable fiber, compressed, natural, synthetic
"Butyl rubber is a copolymer of isobutylene and isoprene. It has exceptionally low gas and moisture permeability and outstanding resistance to heat aging, weather, ozone, chemical attack, flexing, abrasion and tearing. It has good resistance to phosphate ester based hydraulic fluids, and has excellent electrical isolation performance. Butyl is not recommended for use when in contact with petroleum oils and fluids. The temperature range is -55˚C to +120˚C (-67˚F to +248˚F). We carry only in sheet material."