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Discussion Starter #1
Anyone used Sonicbarrier MX4 from Parts Express? If so, what has your experience with it been? On Sunday I had to remove my door card as it sounded like the midbass was making terrible noise (think it's hitting the door card at high volume). Anyway, with the door card removed I noticed that the MX4 looks to have been melting inside my door.

There are spots on the bottom of the door card where it has dripped, as well as areas it looks like it melted and started seeping down. What's most disappointing to me is it's not even been installed more than a year, might even be only about 9 months or so and on the inner door skin. It's showing as rated to 160F, which even taking into account humidity in VA and temperatures in the car, I highly doubt it's exceeded 160F. I work from home, so even on the hottest days, my cars sitting in the garage in the shade, not once has it been sat outside so day in the heat. I had planned to install more in the trunk, but will likely look elsewhere now.

Sent Parts Express an email Sunday with some pictures, but have so far heard nothing back which is also a little disappointing. I'm not expecting my money back at this point, but at least some acknowledgement that it shouldn't have melted. Now I get to plan a day or two to try and clean it all off before it gunk's everything up.
 

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ive heard of similar reports on this stuff as well as the few other brands that have their logo on the same product. You can see an example on my websites reference information section of one of those brands where its all dripping off of the roof of a jeep. Best thing to do to clean it up may be to try to freeze it and chip it off
 

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I took a few pictures that I'll post later, not looking forward to cleaning it off regardless of whichever option I use, I'd bet it sucks to remove it.
its miserable to remove. 2 options.. get computer duster and freeze it by spraying it with the can upside down and chipping it off. Or go the opposite route and use heat to get most of it off.
 

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I had some sound skins do the same thing, it is no fun at all trying to get that shit off. Sucks I have two boxes of MX4 that I will most definitely not be using.
 

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I was just watching a Sarah N Tuned video on youtube and she was removing some deadener with dry ice, but it was not a vertical surface. But it came off pretty easy.
 

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Makes me cringe knowing what woulda likely happened if that car was a darker color and spent its life out in the sun like my truck does. Sorry to hear about your bad luck Ian. For what it's worth Noico held up fine for a cheap deadener for two years in the doors of my black Grand Cherokee (couple pieces on outer skin with black on the other side) and it lived outside with sun hitting it. I'd still pay up and get something quality like Resonix next time I buy deadener especially since Skizer is viewing this thread as I type this:p
 

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Makes me cringe knowing what woulda likely happened if that car was a darker color and spent its life out in the sun like my truck does. Sorry to hear about your bad luck Ian. For what it's worth Noico held up fine for a cheap deadener for two years in the doors of my black Grand Cherokee (couple pieces on outer skin with black on the other side) and it lived outside with sun hitting it. I'd still pay up and get something quality like Resonix next time I buy deadener especially since Skizer is viewing this thread as I type this:p
i got my eye on you:cool:
 

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I used a heat gun and a plastic scrapper. It just takes a while. I used goof off to get rid of residue. Worked better than 7 or 8 other products. I'm like "hey I use goof off to clean tar off siding, it outta work on this" and it did. Heating it up to the perfect temp is key. It will release and peel right (mostly) off. If your to hot it melts and to cold it doesn't come off cleanly in big pieces.
 

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Discussion Starter #10
Sucks I have two boxes of MX4 that I will most definitely not be using.
I'm hoping to hear back from Parts Express, it was recommended to me by a friend who used it without any problems, so maybe mine was a crappy batch.

Maybe cut a piece off and let it sit on some newspaper in your car for a few days to get an idea of if it will melt in your or not.
 

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For what it's worth Noico held up fine for a cheap deadener for two years in the doors of my black Grand Cherokee (couple pieces on outer skin with black on the other side) and it lived outside with sun hitting it. I'd still pay up and get something quality like Resonix next time I buy deadener especially since Skizer is viewing this thread as I type this:p
Guilty here as well. I used a bunch of Noico 80 mil, it has held up for years in this 100+ south texas heat.
 

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Guilty here as well. I used a bunch of Noico 80 mil, it has held up for years in this 100+ south texas heat.
I'm sure not envying you right now. Dewpoint is what will ultimately take you down!
 

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Discussion Starter #13
Parts Express got back to me and are going to refund me which is pretty cool of them. They also said that they have been in contact with the manufacturer to raise the melting point and that future shipments will be the updated version.

I found my original receipt, Dec 18th last year and I think I finally installed it in January or February this year, so 8 months.
 
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