Dynomat xtreme on top of Spray-on bedliner

[ISh]

I have done a search and I did not see my answer. I have my motor, transmission and t-case out and I am going to do some sound deadening material. Has anyone or is it worth having the spray-in bedliner stuff sprayed on the underside of the cab before putting on Dynomat or another type of sound deading material. I want to do it right from the start.

 

[OnlyCummins]

I'll be putting a DIY bedliner on the INSIDE floor of the cab on my next vehicle (hopefully a 1st gen).



Don't like the idea of any sort of dried/mostly dried coating on the underside of any vehicle. In my experience it's more likely to promote rust rather than prevent it.



My current vehicle, a '95 GMC K2500 Suburban, is a perfect example of why NOT to use any sort of aftermarket coating on the underside.



Don't know if you're familiar with Ziebart, but it's a, supposedly, professionally applied under & interior panel rust preventative coating. The Sub has been Ziebarted but you wouldn't know it from the amount of rust on the frame & various parts of the body. The frame is especically bad. There was separation of the coating from the frame at practically every frame edge & consequently, literally, sheet rust everywhere! Still haven't got all of it off yet.



It was originally from Ohio, but I've bought other vehicles within a one year span of it, a '94 & a '95, that came from Michigan & West Virginia respectively, & neither one of those were aftermarket undercoated or as rusted.



Good luck.

 

[ISh]

btt

 

[OnlyCummins]

I just re-read your post & realized that you seem to be suggesting that you'll be applying sound-proofing to the EXTERIOR underside of the cab. If that 's the case, AFAIK, that's not how it's usually done. The only sound-proofing that I know of that gets applied to exterior components is for the engine/oil pan. But ... some folks have opted to insulate the engine bay side of the firewall. Haven't read about anyone doing the underside of the cab.



Good luck.