Underbody sound deadening

[drunkenmaster]

Hi,

I am in the process of stripping the inside and underside of my floorpan back to clean metal, then coating with POR15 followed by a layer of underbody deadener.

The underside is not a problem but I am just wondering if this is the best approach for the inside.

Arguments are:

- it wont look as nice on the inside, however it will be carpeted over anyway.

- it will make future floor rust inspection harder, however rust should not be a problem after the thorough stripping and POR15

Thanks

[nutxo]

i plan on using rhino lining inside, might not even carpet it, i like the look of it

[EScanlon]

If you prep the metal correctly you'll be removing the bulk of the loose scale and dusty rust. Then with the Marine Clean and Metal Ready you'll degrease and etch (zinc phosphate) then top it off with POR and you'll have an excellent almost perfectly rust-free coating (note, NOTHING is rust free if it involves steel). The nice advantage of POR is that it will flex, and it will protect that steel better than anything else I've tried.

When you're finished, you will already have "some" soundproofing, but to do it better, why not get Q-Pads. They're replacement Tar Panels that will go a LONG L O N G way to soundproofing the floor. That's what I did, and you can hear the engine, but you don't hear idle vibrations or noise. Trust me on this one. I then put my complete carpet and mats and the results are EXCELLENT.

One BIG IMPORTANT NOTE: Make sure you use an Organic Vapor Respirator when you apply the POR. The can says WELL VENTILATED and they are NOT joking in the very least. The fumes have CYANIDE in it, and it will MESS you up BAD! Even with the respirator I used it strictly out doors and sometimes with a fan in the hatch sucking air out.

2¢

[drunkenmaster]

Is there any difference between an Organic Vapor Respirator and the regular rubber masks with disposable filter attachments you can buy at the hardware store?

As for the sound deadening on the inside, the reason i was thinking about using the paint on stuff was to cover the POR15 as it is unstable when exposed to light? colouration only perhaps, but still...

[Bambikiller240]

Originally posted by drunkenmaster

As for the sound deadening on the inside, the reason i was thinking about using the paint on stuff was to cover the POR15 as it is unstable when exposed to light? colouration only perhaps, but still...

The POR does get "cloudy" when exposed to sunlight, but this does not effect it's function. POR makes a material that can be used to "top coat" the POR15. It is called "Chassis Coat".

[drunkenmaster]

I saw that coating, I guess my argument is that if I use a sound deadener instead of the chassis coat, it has some sort of noise reduction function, as well as being cheaper.