Hey,

I have some question regarding the application of Dynamat material on an FD. Where are you suppose to apply the dynamat material on the door? Is it suppose to go on the outer door skin or the inner shell? I am planning to do the doors, rear hatch, shock towers, and the cargo floor. Any other area that might be helpful but not too hard to get to?

Thanks, Jay

 

Hi Jay, Go to www.b-quiet.com instead of buying Dynamat from somewhere. They offer several products, but their brown bread product is excellent. Has damping characterics off the Dynamat extreme without the heavy pricetag. I've used it several times and I have some on the way for the RX-7. The doors are the main place you want to cover. One or two layers will be real nice. Under the carpet has lots of padding and it is lots of work to really add some here, but can be done. The rear hatch (in my opinion) can use a layer especially if you don't use a hatch cover. The carpet back there does a good job though. Also if you want a little more damping, consider using some spray dampening material on the inside surface of the outer door ski. (The brown bread goes on the inner side right next to the door panel.)

 

No, I'm not going to use Dynamat, instead I'll be using this stuff call Stick'n'Seal. This stuff if about 1/5th the price of Dynamat.
I was thinking for covering the entire outer door skin and maybe doing some of the inner shell as well. Do you think it's worth doing some if the interior plastic panel too?

 

Check this thread:

https://www.rx7club.com/forum/showth...hreadid=136393

 

Yeah, that's where I got the idea to use the Stick'n'seal stuff. This is sold at roof and shingle retailers for around $12.00 per roll of 4"by 130'. Call me cheap!

 

You can buy a decent quantity of brown bread for like $50 and it is just as good as the EXPENSIVE dynamat, not the cheap stuff. The brown bread is lined with a layer of foil in addition to the tacky brown stuff. It does NOT smell like an asphault based product once in the car. Yes that means some of the products on the market smell when you put them in te car.

 

Sounds similar to what I used but alot cheaper (and that's good!) - does it have a foil backing? The dampening quality of dead soft aluminum is what you are after, and the ability to seal any openings that air can travel through. Sound will follow any opening that air can go through.

If it has ANY smell now it will stink like hell when it gets hot.......and the smell will NOT go away. I would do a sniff check and maybe bake it in the oven a little while at low temp before applying it. You could be creating a friggen monster problem.

 

Well, I'm done with the doors and it has done a great job of keeping the road noise out. Yes, this stuff has a thin foil backing to it. This stuff doesn't reek at all.

I thnk that I will continue with the hatch and shock towers next week.

Thanks for the advice, Jay