Dynamat / Peal n Seal... yes or no

Was just looking at B-Quiet product samples...

B-Quiet Extreme says "is a sound dampening material that consists of rubberized asphalt coated with an aluminum top layer".
Same as Peal & Seal.

If it had issues w/melting and smell... why would they continue to use it?

The B-Quiet Ultimate, however, is pure butyl rubber.