How to apply dynamat to car

**randomwalk101** · March 10th, 2003, 10:41 PM

What is the best way to apply dynamat (or similar sound deadening materials)to car's doors? Do I apply them to the outside (innerside of door or door's skin) or applying to the inner side (or right next to the plastic panel? Thx.

**217gsr** · March 10th, 2003, 10:55 PM

Stick it to the metal. Go single layer, floor of trunk to firewall. . . double if you REALLY want it quiet. Do a single layer in all the doors and rear quarter panel and trunk lid. If you have any left, and I'm sure you will. . . go double layer. If you STILL have some left, then go back and use it in areas of your car that still make noise. It's unlikely it will be in the area where the plastic interior piece attaches to the door.

**gsrteggie** · March 11th, 2003, 12:23 AM

Best way to apply dynamat is to clean the surface first with alcohol. Dirty surface=dynamat that falls/peels etc.

After clean, get a heat gun (or hair dryer if no way to get heat gun, hair dryers take alot longer). Heat the body panel so it is not cold (as it probably is for you outside). Then heat the dynmat and apply to the panel. This will allow the dynamat to stick better and be easier to work with and make it contour to the surface you are applying to.

You ALSO want to get a roller (i think wall paper places have them, or u can get a dynamat one), this allows u to hit more contours of the car/trunk, and have more of the dynamat stick to the surface.

**gsrteggie** · March 11th, 2003, 12:24 AM

Oh, btw, apply to the metal obviously, no plastic door panel.

**BoostedEX** · March 11th, 2003, 12:50 AM

If you want to get fancy you can buy the liquid dynamat to cover every nook and cranny.

BTW, more than likely the dynamat will not get rid of all the vibrations due to them having different frequencies....

I had a sentra fastback a couple of years ago with 8 12 inch RF running about 900 watts. I sprayed liquid dynamat on the interior of my doors and hatch and at certain frequencies the car still rattled just as bad as it did without it, wasn't as loud, but still made horrible noise.... but this was also at 153 db hehe.

**217gsr** · March 11th, 2003, 02:51 AM

If you choose Brown Bread, you won't have to do all of the cleaning with alcohol. Like I said earlier, Brown bread is a lot easier to work with than Dynamat. The only preparation I did on my car was that I vacuumed the floor to take off any of the larger particles. Sticking the brown bread to the surface is also easier than Dynamat, as I did not need a heat gun to shape it. Having never done any of the prep. work normally done, I can still confidently say that the Brown Bread is still sticking well to every surface that I put it on.

BoostedEX, Dynamat and similar sound deadening products work by absorbing the sonic energy from sound waves and converting them to heat. Therefore, they don't need to have the same "resonant frequency," which is I'm sure what you meant. [img]wink.gif[/img]

**randomwalk101** · March 11th, 2003, 03:23 AM

Thanks for all the great advice. I'm going to use Brown Bread...already placed an order for 140 sq/ft. I think I'll go two layers, which is recommended by the manufactures as well as other audio fanatics. I don't have a great system in my car..but just want to keep all the road noise out. Probably will take me the whole couple days to pull all the carpet/seats/panels etc out and do the whole nine yard.

217GSR, will this Brown Bread smell? I bought some cheap Dynamat alternative back then for my GSR and it stink like tar for two months or so...Let me know I can prepare myself of some gas mask [img]biggrin.gif[/img]

**217gsr** · March 11th, 2003, 03:39 AM

Randomwalk. . .
Yes, Brown Bread will smell like tar, but it won't be as bad as Dynamat. And after a couple days, it will fade. Of course, the warmer the weather where you are, the more it will smell initially.