Sikk Nation

iTrader: (1)

I've seen alot of cars using resisto, peel and seal and other roofing products. Althogh it's black has alum backing and sticks. they really don't seem to be effective at all for sound deadening. with the good ols fashioned "knock" test even with 2 layers of Peel and Seal the panels usually still have a little bit of tinny sound. with 1 Layer of B-quiet ultimate, Dynamat Extreme or Raam60 the panels sound MUCH more solid.

Sinemeup

Use cans of spray on rubber undercoating (3.50 a can) in your trunk just let dry between layers and it works pretty good... the really thick asphalt undercoating that comes in a can works really good on the underside of your trunk... its just really messy you almost have to use your finger to it on

my 0.02

JohnVroom

I think this is a good point to say 'your mileage may vary' There is a reason some items are pricey ... other than greed anyway... I am currently a fan of Second Skin (doesn't give you hundreds of tiny cuts like Dynamat... it gives just a few artery severing slices though)

DeadlySones

iTrader: (4)

I had an '88 Astro. It was bad on gas to begin with, even with a rebuilt motor and trans, but after I wrapped it in Dynamat Extreme w/some spots a couple/few layers, it got to the point where it lost all power. NO MORE *****... Couldn't afford to feed it gas anymore. Can't imagine how much total weight I added to the van just with Dynamat.... plus enclosure, amps, subs ... poor little tank of a van. It was a great vehicle. When you slammed the doors they went THUD! THUD!

cspurdy

Well I guess it all comes down to expectations. When purchasing a product such as this if you are expecting it to meet or exceed dynamat and the like you will usually find yourself unhappy with the results. My expectations were to kill the rattles and adhere well. I can say in both regards it has certainly done the job. Any sound deadening gained is a side benefit to me.

sweetlikechutny

look into fatmat. I got 100sqft for 140 bucks.

Also, use trunk bedliner, not rubberized undercoating.

Sparx123

What is the difference between all of them that are pretty much the same thing aren't they all just aluminum backed sticky rubber? So how could one stand above all the rest?

JohnVroom

how could one stand above all the rest? simple either adhesion or performance or price.

if it doesn't adhere well IT WILL NOT dampen worth a darn
a big part of this is mass load so if it is light it wont dampen much
if it has a poor vibrational characteristic (stiff or gelatinous) it wont dampen
if it is expensive that implies quality (no guarantee) if it is cheap it implies crap (no guarantee)

jstoner22

iTrader: (1)

thats my train of thought right there.

first and foremost i look at...
adhesion-the better the bond between surfaces, the easier it is to install, and stay that way over time, and the better the dampening abilities of the product.

density-by increasing the mass of the object, you are reducing its ability to flex, vibrate, etc. you would need twice as many layers of those rubber/asphalt products to acheive the same density as dynamat xtreme (which would be half the thickness, again making for an easier install).

malleability-again, if is the product stiff or malleable etc, will affect the ease of install, ability to create good bonds between surfaces, which is essential for proper dampening, lifespan, etc.

thermal properties- although some products perform relatively good at normal temperatures, they drastically lose their dampening abilites in hot or cold weather. dynamat and second skin products will not stiffen in the winter, or melt and lose adhesion (or smell) during scorching august summer days. as well as this, a side benifit is that they insulate your car. they will help keep it cooler in the summer and warmer in the winter.

add it all up and you are allowing your system to be more efficent and louder by transferring that energy into sound, rather than vibrating sheet metal, and sound better by reducing rattles.

i could go on, but there are many reasons why products like dynamat and second skin cost more. they are simply better products.

i suppose if you know what to expect with the rubber/asphalt subtitutes they are fine. but in my opinion, if you just want to get rid of rattles, just stick some rags between surfaces to prevent rattling. you'll get the same effect.


the bottom line is. you get what you pay for.

nobb

The roofing based asphalt stuff is a cheap alternative, but I wouldnt recommend using it anywhere upside down, like a trunk lid. I would only use it on surfaces that wont require the stuff to work against gravity too much, or use some sort of super strong adhesive to spray on first. The reason why is because over time, it will mostly likely start to come off. I would know, since I used some Resisto on my trunk lid and its coming off after 2 years.