I should stress that there was a reduction in sound, I would describe it as a little more "muffled" or "muted" now. Anthony at SSA suggested I also put Damplifier Pro on the sheet metal under the sound mat of the engine compartment as well. I decided not to do that. The modern materials do help a small amount just not as much as would have thought or as much as a Carrera.

I also tried putting a heavy wool blanket over the rear seats and draped over the kick panels - not very scientific but still no difference.

i was just about to talk about that. in years gone by, and some still do it today, products like dynamat always preached 100% coverage which is simply not needed for 99% of the installs it is used in. 25-40% is more than adequate to stop the vibrations in a car. the companies said this to sell more product but they were going after a result that would never be achieved - sound reduction. that cannot happen with this type of product.

in the spring i plan on installing new carpet, along with some damp pro and lux liner pro. i will be using the scientific tap-test for the damp pro and then (hopefully) one solid layer of llp.

Look into the Quiet Coat. My car is reasonably quiet and it's a Cab. Hardly any road noise and very very little exhaust noise. I have a pre-muffler and a M&K 1 and 1 Muffler.

I painted the floor from door to door and the entire back seat area. I haven't done anything to the interior of the door skins, but when I rebuild the doors I plan in doing those.

Wow! I'm lovin' this. I was hoping for a few "tips" and here we are on page three.
I'm still digesting all the info. So far, no definate decision on what to go with but I'm busting wanting to get these beautiful carpets in the car.
Which ever route I go I'm gonna take pics along the way.

Thanks again for all the help.....what a great place!

where do you get the Quiet Coat?

Just googled it.... QuietCar

The website says it's cured weight is 8.5 lbs per gallon, and the typical car needs 1-2 gallons.

QUIETCAR

Okay, I know this was overkill but I also sprayed then re-brushed (back seat area) over the floor and on top the Damplyfier Pro. The product covers well, I closed off the old AC opening under the dash and this stuff created a nice texture cover over my welding repairs and with the gun give a nice spackle effect. Even adheres to silver backing of Damplifier, it's tough stuff.

Note: Be careful spraying this, it can create quite a bit of stray spackle and this stuff really adheres so use proper prep/taping.

Your are correct sir!

It is QuietCar. I used 2 gallons on the tub. I brushed on 4 or 5 coats, I think it was easier to control that way. It is a very thick liquid.

there are lots of versions of liquid vibration dampers on the market. here are a few in the order i would use them.

Spectrum - Acoutic Sound Deadener Coating Material

Elemental Designs

Daubert

Can't help but notice you didn't include "Quiet Car"!
Is that because you don't like it.....or never used it?
Thanks.

IS the Quiet Car product a liquid vibration damper??

I would call anything using the ceramic micro-bead technology an absorber & dissipator of sound energy, not a dampener...

i didn't include it because it had been mentioned several times in this thread already. i have no experience with it though.

Thanks. I value your opinion since you've had hands on experience with this.

I forgot to add, but before I put down the foam, I sprayed 3M undercoat on the entire area which is something I do not recommend based on the fact that the fumes almost killed me. Took days before the smell went away, but it filled in all the cracks.

you put undercoating on the Interior???

well this is what their site says...




QuietCar is an advanced viscoelastic polymer soundproof coating for all outdoor applications, specifically cars, vans, trucks and other vehicles. QuietCar can be applied by brush, roller, or sprayed on with the optional spray-gun (sold here) for air compressors or an airless paint sprayer. The advanced viscoelastic properties allow the coating actually absorb unwanted noise and vibration, rather than just block it (which is what mats do).
By absorbing vehicle body vibration, engine and road noise can be reduced by up to 20dB, depending on vehicle and application. This can make, for instance, subwoofers sound 3dB louder (the same as doubling the power!).
The more you apply (underside, inside under carpets, wheel wells, engine compartment walls, trunk etc.), and the thicker you apply, the more noise will be absorbed.



notice that last part i highlighted. that is reason enough for me to not use their products. i don't need the company blatantly lying to me from the start to make me buy more product than is necessary. that is as technical as they get anywhere on the site that i could find. another point to keep in mind is that all of their tests compare the product to asphalt mats, not the modern butyl-based multi-layer products offered by many companies.

I have nothing to gain or lose here but, QuietCar works. Sorry I you were offended by what they state. I read it several times and don't see where they were lying. I don't think they were trying to be deceitful. The company is just trying to say the thicker the coat the better it works. I used 2 gallons on the inside of my car under the carpet and it made a huge difference. With the windows up in my Cab. the interior is almost quiet. No road noise either. If I had it to do over, there is no question, I would use it again.

it only bothers me because i was one of those who was taught, and believed, more is better and 100%+ coverage was needed to be effective. i used over 50sqft of dynamat xtreme in one of my cars when i could have achieved the same results with less than 20 and saved quite a bit of cash.

for years 100% coverage, and multiple layers, was drummed into everyone's brain as the proper way to go about using a damper and that is just not the case. on average you only need 25-40% coverage on flat panels to accomplish what a vibration reducer was intended to do. the 100% approach was simply a way for the companies to sell more product. even the companies that produce similar liquid products today only suggest a maximum of a 3mm coating applied over 2-3 layers. making the statement "the more, and thicker, you apply the more noise will be reduced" is just a lie. at some point the returns will not only diminish but stop, and while a vibration damper will reduce some noise that is not it's intended purpose no matter what the marketing says.

everyone does things slightly different than the next guy and some have done things more than others. i am just trying to relay my experiences with this since i have a lot of time invested in this hobby. i am by no means an expert (as i have already proved in this thread :) ) but i have read more on the subject than the average person.

I sure did and in all honesty, it looked a hell of a lot better then it did before. This was after I cut the rust out and fiberglassed over the holes.