Thinking about spraying the bottom of my cab with rubberized soundproofing

I'm thinking about spraying the bottom of the cab with a rubberized sound deadening spray. (Saw a can at a local auto parts store.) I rode in a bud's 2012 Taco, and it seemed quieter than mine. He had his truck undercoated at the dealer when he bought it.

I've always thought the cab of my '08 was a little loud for my tastes, and thought this might be a first step to quiet it down. My frame has already been coated by the local dealer during the recall, so I won't have to worry about rust (not to mention I would like to keep the spray off the frame too, since it won't help with the soundproofing), but I won't worry about overspray there. I'll tape off all brake & fuel lines, transmission, drive shaft, etc. to keep it off anything serviceable.

Has anyone done this before? If I do it, are there any pitfalls to avoid?

Pros & cons?

 

I live in the rust belt and I wouldn't do it. When the rubberize coating dries, it dries hard and after a few years it'll start to crack. Once it cracks any moisture from winter road chemicals will find it's way in to the cracks and start the rusting process and it'll rust much faster. I think you're better off using a product that stays pliable, stays tacky, self heals under the cab and using the sound deadening sheets in the inside of the cab. I used a combination of Fluid Film and Eastwood Anti rust and it seems to be holding up quite well. First apply the Eastwood product, let it cure a few days then add the Fluid Film. Easy to touch up to but and both do not dry to a hard surface where the sun doesn't see it.
All my body cavities, doors, rocker panels, internal hood cavities, and inside the fenders and done with both products. It's messy and there's quite a bit of waste when it drips out of the doors and rocker panels. Just be careful of window rails.
Can't say anything about desert sand though.

https://www.eastwood.com/xmat-sound-deadening-18x32-ines-34-8-sq-ft.html
https://www.eastwood.com/eastwood-heavy-duty-anti-rust-in-amber.html

 

You're better off using a sound insulation mat like Dynamat.
It is more effective than the spray on sound deadening spray.

 

I pulled out my seats and carpet and applied sound deadening. Made my truck so much more enjoyable on highway cruises. Did the doors and the back firewall as well. Doors close with a satisfying "whumpf" sound now. Going to get around to doing the roof eventually

 

That rattle can stuff is not nearly effective as the coating a dealership can apply. You'd have 50 to 100 bucks in supplies and I doubt you'll be happy. You could use that same money on sound deadening material and I think you'd be much happier. I think 36 square feet of Noico sound deadening is like 60 bucks on Amazon. If you apply it underneath the carpet i think you'll get you best bang for your buck.

 

Gentlemen, there's a big difference between spraying undercoating on the bottom side of the cab and applying sound deadening material to the inside of the cab. And since the OP lives in Virginia, I don't think the (valid) concerns on undercoating actually causing rust later in life come into play - unless he's driving on the beach. That said, most undercoating sprays do little for noise deadening.

 

I would avoid any rubberized coating but do as you please with your truck.

 

We get snow and salt here too. Plenty of rust buckets.

OP I would also avoid an under spray for the reasons mentioned above.

 

Hmmm, interesting. I'll bet you don't see anywhere near the amount of salt that we use up here though. We get white outs the day after a snow storm - from all of the salt residue on the roads.

 

I’m not arguing that at all. This was just in response to this
vvvvvvvvvvvvvvvvvvvvvvvvv

 

Look into solvent undercoating. It stays soft avoiding the cracking/drying out issue. I get all my new vehicles undercoated, keeping them 10-15 years, never experienced the rust attributed to undercoating.

 

Did you do the floorboard first, drive around then do the doors/back wall later on?

I've done the doors/back wall and roof. Doors and roof being the most effective of the 3. Roof for rain/wind noise. Doors for road noise and improvement in oem speakers. But curious how much the floor makes a difference. What did you use on it? Just the butyl rubber mat? or a closed cell foam?

 

No argument here either - ad thank you for your service! I'll bet you don't get this kind of rust down there though:

 

Holy crap! I wouldn't be driving that thing! Looks like it could literally fall apart at any time.

 

I did the doors first, then the floor and back wall. I also found that the doors made the most difference, but the floors certainly helped. I used 80mil noico material.

 

I used sound deadening inside my cab everywhere. It has made a huge difference in road noise. And it's so much quieter in the rain. Can't hear the drops at all. Did the entire floor and all doors as well. No pics. Did it before I installed my stereo.

 

Sound deadening in the doors helps the stock speakers create a little bass and overall improves sound quality. I'd recommend sound deadening on the doors before a speaker upgrade. Just don't leave the factory vapor barrier off the door unless you re-skin the door with sound deadening. If you leave the vapor barrier off you door panels are likely to start rotting and you windows stay fogged. Unless your somewhere like Southern California and don't have a clue what real humidity is like.

 

I don’t mind the noise. It’s a truck not a Benz.

 

Well, it's a Chevy so.......

 

I was just advising sound dampening in another thread, and pulled out the pic of what I did to the rear, with plans to eventually do the whole cab.