Spray thermal insulation / Sound deadening?

[BroncoJimbo]

I used Second Skin on my Mustang and it was a remarkable transformation. Foil backed insulation and then the heat shield which is a thin, closed cell foam. My Mustang is like a Caddy inside.

 

[broncobuddha]

So one product is both?

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[EPB72]

https://www.secondskinaudio.com/sound-absorbing/ I also used second skin but there sound deadner as well as afew other products of there's no complaints... I used lizard skin as well the thud factor once coated is good but not near as well as using a stick on product .. as far as trapping heat in insulation o some sort and headliner { thats whats on all these daily drivers OE} and stopping sources of drafts.. FWIW my garage is about 55 degres, the bronco frame is cold to the touch, and the lizard skin painted floors are quite abit warmer to the touch, and touching other panels without lizard skin they are a little cooler to the touch.,,, top coating lizard skin no problem,

 

[Broncobowsher]

If it is already rihno lined on the outside, I see no reason to add additional sound material to the inside. Thermal insulation, plenty of need for that. Maybe not so much as you go topless in the summer.

 

[broncobuddha]

Raptor lined. Different for sure. I still need something to at least combat the mechanical metal sounds when driving. I wouldn't think covering the entire underside would be needed but perhaps 4 squares spaced out evenly should take care of that. Then put whatever heat insulation over it.

 

[DirtDonk]

I didn’t find raptor liner much good at sound deadening. The whole interior of my 68 is body color raptor liner. Super nice, great looking, easy on the knees. But still far too loud on the inside.
I used some sound dampening undercoating on the bottom side and that helped quite a bit.
Still going to do more, plus the roof like you’ve been talking about.
Quieter is better…

 

[DirtDonk]

You could always make your own too. Not sure if it works as efficiently, but you could probably add ceramic beads to just about any sound damping liquid and maybe kill two birds with one stone.
Don’t know that for a fact, of course. But I do believe several members here have created their own thermal barrier using standalone ceramic beads stirred into the liquid.

 

[broncobuddha]

You could always make your own too. Not sure if it works as efficiently, but you could probably add ceramic beads to just about any sound damping liquid and maybe kill two birds with one stone.
Don’t know that for a fact, of course. But I do believe several members here have created their own thermal barrier using standalone ceramic beads stirred into the liquid.

Yeah, Paul....check post #15 in this thread. It's an option.

 

[DirtDonk]

Yeah, saw that. Made me think about the ceramic beads. I just didn’t see any details listed, even in the pictures, in OR‘s post.

 

[broncobuddha]

The Amazon hyperlink goes to the product to add to your liquid deadener of choice. I'm going to read up more on it.

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[bronkenn]

I used HyTech beads addd to the Raptor liner and it really insulated well. https://hytechsales.com/insulating-additive

 

[Big Slim]

not spray on but I used 10 mm smartshield foam. On Amazon. One roll did the whole top. light weight and sticks on.

 

[DirtDonk]

The Amazon hyperlink goes to the product to add to your liquid deadener of choice.

Thanks. Didn’t even notice the link on my phone. But now there is the “ahh, now I see it” moment.

 

[abrogate932]

I used to be a LandCruiser nerd and worked for Proffitts Cruisers for years. We made some very nice LandCruisers that people with obscene wealth would sign up for a multi-year wait list to pay a mortgage for a FJ40. Nearly every LandCruiser we built would get the tub lined on the under side and inside with a product called Vortex Polyurea coating. I am not certain which exact product was used and they offer a variety, but it was awesome for deadening, thermal barrier and adding some rigidity. We would have it color matched to the paint with great results. If I could afford it, I would have this done to my hardtop interior for my Bronco. This truly made a difference in how the trucks felt when you would drive them. It really made them feel like a "luxury" vehicle compared to the OEM faithful restorations we did.

https://www.vortexcoatings.com/products/

https://vortexsos.com/vortex/

You may want to see if there are any companies that spray this in your area.

At some point our boss had one of our projects taken to the local Line X shop and they just do not compare. We never went that route again.

 

[ntsqd]

I had a black '91 Square body Suburban that the headliner was failing on. Pulled it and sent out to an upholstery shop to have that fixed. While I had those two massive head liner panels out I added full coverage Reflectix to the underside of the roof skin. Goal was more thermal insulation as on really hot days you could feel the heat coming thru the roof. On the next trip what amazed me was how much quieter it was inside. Prior to adding it talking between the front and back seats was difficult. After adding it you could have a normal conversation. Really surprised me that some that flimsy and light could have that much noise reduction.

In the 4rnnr I added some amazon sourced mass loading stuff similar to Dynamat to the rear 1/4's. That helped with the noise. I put a layer of a self-adhesive thin insulating foam from Lowe's over it ("Frostie", something like that) and I can't say that it made much difference.
I know of one guy who lucked onto a sale of Ensolite back-packing sleeping pads. He used those for thermal insulation inside his doors and maybe other places as well. Some 3M Super 90 will stick that stuff where ever you might want it. Maybe keep an eye on Overstock or Sierra Trading Post for a sale on that stuff?

A friend has done the two different LizardSkin products on his Scout 800, but it's till a WIP so no idea how well it works. Looks good. He put it on the bottom of the floor and the engine side of the firewall.

A point got driven home a while back. Recall that most cars come with some sort of insulation pad on the underside of the hood that is now MIA? I've seen a couple guys put Dynamat type material on the underside of their hoods and report back that the noise reduction was significant.

 

[Broncobowsher]

I had a black '91 Square body Suburban that the headliner was failing on. Pulled it and sent out to an upholstery shop to have that fixed. While I had those two massive head liner panels out I added full coverage Reflectix to the underside of the roof skin. Goal was more thermal insulation as on really hot days you could feel the heat coming thru the roof. On the next trip what amazed me was how much quieter it was inside. Prior to adding it talking between the front and back seats was difficult. After adding it you could have a normal conversation. Really surprised me that some that flimsy and light could have that much noise reduction.

In the 4rnnr I added some amazon sourced mass loading stuff similar to Dynamat to the rear 1/4's. That helped with the noise. I put a layer of a self-adhesive thin insulating foam from Lowe's over it ("Frostie", something like that) and I can't say that it made much difference.
I know of one guy who lucked onto a sale of Ensolite back-packing sleeping pads. He used those for thermal insulation inside his doors and maybe other places as well. Some 3M Super 90 will stick that stuff where ever you might want it. Maybe keep an eye on Overstock or Sierra Trading Post for a sale on that stuff?

A friend has done the two different LizardSkin products on his Scout 800, but it's till a WIP so no idea how well it works. Looks good. He put it on the bottom of the floor and the engine side of the firewall.

A point got driven home a while back. Recall that most cars come with some sort of insulation pad on the underside of the hood that is now MIA? I've seen a couple guys put Dynamat type material on the underside of their hoods and report back that the noise reduction was significant.

I should walk you through a new car and what is done and why. Are they chasing low frequency noises, or high frequency. Transmitted through a part, or is it coming through a hole? A lot of new cars have laminated side windows now, strictly for acoustic reasons. There are even special acoustic glass that is sometimes only used on the upper trim levels. The NVH department even has a calibrated hammer. it has a sensor to measure how hard you hit a part when checking for resonances. There is a science, as well as an art, and a fair bit of trial and error.

And you can cheat at times https://www.grainger.com/product/80...:CSM-190:D5UAHM:20500101&utm_id=6606939904206

The hot rod shops that cover every square inch under the carpet with dynamat, they are doing it wrong.

 

[ntsqd]

When I was at APT we sourced a sheet of the blank that then current production PSD firewalls were stamped from. Had two thin steel layers with a double their thickness layer of "dynamat"-like material between them.

When I said that I didn't think that the Lowe's sourced foam didn't make much difference I meant in thermal rather than acoustic.

A project that I had while at APT was that the roof vent in the dyno room was allowing too much noise out. It was just a square hole in a poured concrete ceiling. We were exchanging the air in that room every 10 seconds when we had the turbo under test (& still could get it from ambient to 90°F+ in ten minutes of run-time). I built a baffle of 3/4" MDF that sat over the hole and was lined with some acoustical foam from McMaster. It cut the noise to less than half of what it had been.