ha, is that who rudy is? i was wondering about that he posted a few times in other sound deadening threads and i was impressed
that wasn't my intention, but we do learn best from our or others mistakes no? One of my friends from a while back was a general contractor and decided to do his whole truck in peel n seal. I have no idea how it looks now since I haven't seen him in years but I thought it was a good idea at first. Then I did some research and found it wasn't.
Here I am popping in I haven't seen any Hushmat firsthand, but my understanding is that is very close to Damplifier in quality. Maybe get your shop to do the job then send me some scraps to test?
Seriously though, the most important thing is that you not use asphalt. If you have any doubt, there are two simple tests you can do. Either will give you what you need. Test 1: drop a small piece in a few ounces of mineral spirits or turpentine. Wait 15 or 20 minutes. If the liquid turns brown, it is asphalt; black and it is butyl. An easier test is to try and light a piece on fire with a butane lighter. Butyl will ignite, asphalt won't. Only takes a few seconds to light, but watch out, it does that freaky flaming drops thing light plastic does.
Using a vibration damper like Damplifier or Hushmat will do several things for you. It will improve the quality of the music you hear by reducing resonance in the sheet metal and it will reduce transmission of noise into the passenger compartment. As has been mentioned, to maximize both improvements, you really want to add a layer of closed cell foam to the project. The two approaches combined are much more effective than either one alone.
so closed cell... should you do the entire car in that as well? just go over all the sound deadening? or just certain parts
Also, what about the trunk, do that as well?
so what closed cell do you suggest?