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Yesterday I made the purchase of Dynamat xtreme and Dynaliner. I felt I made the right choice especially since we will retire to Texas. Felt the extra cost was justified for Dyna. Yes I am aware there are other products, stuff at the home improvement stores etc. Anyway, today I am talking to a guy who restores corvettes, mostly C2's, he said to make sure the Dynamat does not contain Butyl. He says Butyl will leach out the chemicals in the fiberglass and make it soft and weaken the areas it is placed. I checked the Dynamat's site and sure enough Dynamat X does indeed contain Butyl. I have a 78. For those of you that have done this mod years ago, have you seen any ill affects? I did see a few posts were the question was asked if there is a chemical reaction, but nothing clearly stating someone had issues.
I’m no chemist but I’m sure there are hundreds of forum members on here that have used the Dynamat on their fiberglass floorboard with no ill affects. A search of the forum should prove that out. I just bought Hushmat. Seemed to be an equivalent to Dynamat except they make bigger claims of heat reduction with their product vs Dmat Extreme. Extreme is advertised more for sound. Hushmat had a huge Labor Day sale which made the choice a little easier. I plan on installing Dynaliner over the Hushmat before replacing the carpet.
Also looking at the DEI exhaust wraps and pads for adhering to the underside of the floor board. I’d like to do the tunnel but I’ll wait until I need to drop the transmission which I hope is a very long time.
Wife and I were out for awhile last weekend. I think I was about medium rare when we got home and that was in Pennsylvania.
Where would you put Dynamat on a 78 that it would touch fiberglass?
The floorboards are steel. The transmission tunnel is steel. The rear wall is steel. The only spot would be right under your feet against the firewall.
Depending on what you are after, you may not need as much as you think. Even Dynamat will tell you that 100% coverage is not needed to dampen the sounds. Heat insulation is a separate issue, and is always best done before the heat gets to the floor.
I've had butyl rubber noise deadening of a different brand in my 77 corvette for over 10 years with no ill effects. Even have some on the inside of the outside door skin and t-tops. Both are fiberglass.
If this is a repeat post, sorry. I clicked post quick reply and my reply did not appear.
Thank you all. This is pretty much what I thought also. In the end I have to weigh all the information and feel I am make the correct decision. The link below will take you a good posting about Dynamat and how much to use. #12 post is from DUB like me, many of have benefited from DUB's knowledge. I will following what he is recommending. Also post 13 is from the customer he is talking about. One other thing, I am not just using Dynamat alone, I will also add Dynaliner. https://www.corvetteforum.com/forums...do-i-need.html
Dynamat, butyl affect longterm
