My comment is based on my experience. I used to stick bitumen strips on my door panels. After a few months, when I open it, it is so messy that I have to clean it up with lots of thinner and when the temperature is cold (that means at night!)...
After taking those strips off (they are not strips anymore... they are like semi-hardened black tar), I now use this material called Wurth... expensive but have better sound dampening effect and less messy.
After taking those strips off (they are not strips anymore... they are like semi-hardened black tar), I now use this material called Wurth... expensive but have better sound dampening effect and less messy.