hi NiCKY7
this SikaDamp630 is much better than bitumen, and lighter too! safe, no odor.
it's different than SuperLon, which muffles low-bassy noise.
SikaDamp dampens the high-frequency vibrations, noises especially from metal.
so yea, using them on metal surfaces like doors, boot, boot area (or anywhere exposed metal) would greatly quieten a car's interior.
Yes, stock is available now :) if i ran out, just gimme a few days for the new stock to replenish.. :)