Thanks. Did you use 3M spray adhesive?

I undercoated all the insides of my fenders quarters trunk area around gas tank on inner quarter in side of the doors.  Do not use hardware store grade big difference.  I purchased mine from keystone automotive good product. Also when I was getting ready for paint I used their epoxy primer.  The sheet material you used is good stuff it makes a difference I used that on top of my undercoating with the 3m adhesive #90.  I still have lots of noise from my flow master 40s. I liked them when I was younger still do for when you start the ole gal up but to drive for long periods sucks.   You can get that material from lowes or the depot in lumber area.  It's just an insulation.  A good sound deadener is a SEM automotive foam. Or evercoat foam.  I used it on my k10 wish I would've on the stang.

65GT,

Please take this as a constructive comment: the stuff from Lowes and HD is for houses, please buy sound deadener designed for vehicles. There are lots of products out there and some are reasonably inexpensive. Besides, if you use an asphalt based product inside your Mustang, the inside of your Mustang will smell like asphalt in the heat of the summer, which is about nine months of the year in Houston.

I always love the posts from those condemning peel and seal and similar, but have personally never tried it.  As for the smell, most never smell anything, or if at all it out gasses quickly and never smells again.

I have original flowmasters with dumps and it's stupid loud, Loud enough to make my ears ring.

Over the past week i ripped out the old carpet, and covered the pans with lowes peel and seal, then added mass backed carpet.

The difference was night and day.  I was hitting 80+ db at idle before, and now i hit 68-70 db, and that's without part of the rear pan covered and no seats, and with the thicker carpet

It quieted it down so much im in shock.

I spent $50.  Do what you guys want, but it works.

We must be thinking of two different things from the home Improvment stores.   The insulation I'm talking about it a heat and sound barrier with aluminum on both sides so asphalt at all. If you put a home insulation next to a car sound barrier such as Danamatt or what ever it is you will not see a difference.  My buddy got some of the Danamatt from speedway I beleive ran out I showed him the stuff at the depot and it looks feels the same in every characteristic.

I haven't done my Mustang yet, but I picked up a Fatmat kit from Amazon. Used it to do the cab of my 95 Lightning. Top notch stuff, had enough to do the floor, roof, and both doors with quite a bit left over for 200.00. I'm not sure it would be enough for pass compartment, roof and trunk on a 65-66 Mustang, but depending on how you use it it might be close.

I am definitely not disparaging what others have used, but I wanted no smell and was worried about some of the chemicals used in the non-automotive stuff. I also live in Tx and the truck is black so temp is definitely a concern. I installed it mid summer and leaving out in the direct sun only made it more pliable to work with and did not appear to affect it. I did have to pick it up with gloves though

Last edited by Raymond_B (2/08/2015 6:58 PM)

Thanks all. Interesting talk. Sounds like Lowes may be ok if no petroleum base aspect. Will check it out and see if I can find the specs on the other products to compare. Thanks again.

Here is my long-term use report on that similar product from Lowe's.  It is specified for roofing valleys.  I think the adhesive probably works long enough in that application to get the nails in it.

If the surface is not 100% perfectly clean and painted, it will not adhere.  The underside of my cowl was done and it all fell off within 6 months.  The adhesive appears to have just evaporated as the black rubbery part that was so sticky when I installed it is smooth to the touch now.

I put it on the vertical surfaces behind the kickpanels.  It is still adhering nicely as evidenced when I pulled the panels off yesterday after two years.  The kickpanels themselves probably kept it pressed tight against the surface.

It does well on floors, as it has not fallen off the floor!

Bottom line... It is inexpensive but there are probably better products to use.  Might be fine for floors if you don't mind doing it in 6" wide strips.  But, if it does release, it could get water under it and hold it there until it can leak out through the rust holes.

 

I bought this stuff - http://www.raamaudio.com/ - a butyl based product very similar to Dynamat but a better price (and it's not covered in logos). I'm in the process of putting it in and so far it's going well, easy to work with. I also bought some of the Ensolite IUO with the RAAMmat.

Everything I've read about using the peel 'n' seal asphalt based stuff says it will not stay stuck to vertical and overhead surfaces - period - dont' know that it would work better or worse otherwise but I agree with the 'use a product intended for the application' statement.

please read here, dampner materials reduce vibration.  This place shows the steps to correctly block sound.

you dont need to use dampner material all over the place.  When you get a idea of what noise is then you can block it correctly.   Read the explainations of each step / process   


http://www.cascadeaudio.com/car_noise_control/

I used a combination of roll-in bedliner and two layers of dynomat on the floor and firewall. The doors have dynomat on the inner and outer skins. The roof has two layers of dynomat as well.

Other than the car having a very satisfying "thunk" when you close the doors, it is just as loud as any other first gen mustang I have ridden in. It was very disappointing. I can tell that the majority of the noise comes through the windshield and the trunk. I have started trying to isolate the trunk noise from the cabin as my next step.

Summary: Do it, the A/C and heat will be more effective, but it will be just as noisy.

BobN

I used Fatmat? or some such thing as well as the Dynomat and some Lizard skin? or what ever and it took a lot of time. Minor change. I spent much less time and fixed the fit of all the weatherstripping around the doors and windows and trunk which made a much better improvement.