Under Hood Coating
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- fish
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- Location: Las Vegas, NV
Under Hood Coating
Hey guys--
Has anybody reapplied the underhood texture coating after removing the old stuff? I contemplated just leaving it without the coating, but it looks like it'd be useful for protecting the outside paint from some of the engine heat as well as knocking down some of the panel noise, so I'm thinking I ought to put something on to replace the factory coating. The OEM coating looks vaguely like the stuff that's inside the doors, too, so it might be a two-fer (although I'm leaning toward some of the 3M NVH products for the doors).
I've looked at the 3M and Wurth rocker shutz/undercoat products, and they're good stuff, but it doesn't look like the texture finish is the same as OEM and I'm not sure how happy those would be with constant exposure to engine heat. Anybody have any success with a specific product?
--Scott
Has anybody reapplied the underhood texture coating after removing the old stuff? I contemplated just leaving it without the coating, but it looks like it'd be useful for protecting the outside paint from some of the engine heat as well as knocking down some of the panel noise, so I'm thinking I ought to put something on to replace the factory coating. The OEM coating looks vaguely like the stuff that's inside the doors, too, so it might be a two-fer (although I'm leaning toward some of the 3M NVH products for the doors).
I've looked at the 3M and Wurth rocker shutz/undercoat products, and they're good stuff, but it doesn't look like the texture finish is the same as OEM and I'm not sure how happy those would be with constant exposure to engine heat. Anybody have any success with a specific product?
--Scott
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- Roadster Nut-Site Supporter
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Re: Under Hood Coating
I don't remember what I used but it was an aerosol can. It came out pretty good, I found that you need to hold the can at an angle to the surface in order for it to build up any thickness. I used two cans. I think that with nothing it would be tinny and rattly. If I were doing it over though I would use Lizard Skin and get a thicker more OEM looking coating.
located in Chester NH
1967 1600 in restoration
2013 Arctic Cat F-1100 turbo
Ford F-350 6.0
Ford 9000 puller, Ford 960 puller, Ford 901show, Ford 971 worker, Oliver 70 waiting its turn
1967 1600 in restoration
2013 Arctic Cat F-1100 turbo
Ford F-350 6.0
Ford 9000 puller, Ford 960 puller, Ford 901show, Ford 971 worker, Oliver 70 waiting its turn
- Linda
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Re: Under Hood Coating
What about using an under hood insulation? Easier to work with and changing it out is easier also, it seems to me. I saw one that was designed to melt the clips in a fire and then fall to help smother it. Something like this:
https://www.carid.com/articles/hood-ins ... touch.html
Linda
https://www.carid.com/articles/hood-ins ... touch.html
Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
- bakerjf
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Re: Under Hood Coating
When/if I have to do it again I’ll use Line-X, and then paint it the body color.
J. Baker
Lafayette, CA
'69 2000 (Solex)
Lafayette, CA
'69 2000 (Solex)
- bobd
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- GeoffM
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Re: Under Hood Coating
If I recall correctly, one of the long-time roadster guys told me that under-hood coating was not OEM. I'd be surprised though, as almost every car I've seen has it.
Geoff
1969 SPL-311
1969 SPL-311
- 68DSU
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Re: Under Hood Coating
I recall having an uncoated hood. It may have been a replacement after an encounter with another car in the 70's. I coated it partly to give it a little more strength to resist the oil can effect. I used a spray on underseal but there are plenty of better products on the market now.
Rick
Constantly working on the Datsun whenever I get around to it.
1968 SPL 311
1987 Toyota MR2 T-top (don't hate, wife's car)
2014 Ford Mustang convertible
SPF 50
Constantly working on the Datsun whenever I get around to it.
1968 SPL 311
1987 Toyota MR2 T-top (don't hate, wife's car)
2014 Ford Mustang convertible
SPF 50
- spl310
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Re: Under Hood Coating
I am certain that many roadsters had that stuff. Very early and very late cars may not have. Replacement hoods didn't iirc
"Wow, a Roadster!" Stuart Little
1967.5 2000
1967.5 2000
1964 1500
1964 1500
1967.5 1600
1968 chassis
2006 Acura MDX
2013 Volkswagen Jetta TDI wagon
1995 F350 Powerstroke!
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1967.5 2000
1967.5 2000
1964 1500
1964 1500
1967.5 1600
1968 chassis
2006 Acura MDX
2013 Volkswagen Jetta TDI wagon
1995 F350 Powerstroke!
More...
- fish
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Re: Under Hood Coating
I'm pretty sure it was an OEM coating; the same stuff is inside the doors and rear quarters (behind the vinyl panels) on both of my cars. I like the idea of using the polyurea bed liner or one of the 3M products, but just wasn't sure how well they'd respond to engine heat. I may shoot a couple test panels and stick them under the hood on the '66 and drive that around a little to see how it does. It's entirely possible that I'm overthinking this, too.
- SLOroadster
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Re: Under Hood Coating
Nope, I scraped all that stuff off when I painted my car and it made zero difference in sound. It did take about a pound off the car however.
Will
Sorry, I find modern engine swaps revolting. Keep your G, R, or U series in your Roadster!
- jrusso07
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Re: Under Hood Coating
You can use the clear coat chip gaurd usually applied to rocker panels. I used it in a z car under hood (and rockers). I don’t remember the product brand or name. It has to be reduced and sprayed...
Last edited by jrusso07 on Thu Mar 28, 2019 6:39 am, edited 1 time in total.
Joe
1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311
1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311
- datsunrides
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Re: Under Hood Coating
I use Dynatron Dyna-Pro undercoating under the hood on all my restorations. Can be topcoated after it dries. I like it because it hides all the little imperfections without the need to spend hours doing it the traditional way.
1966 Roadster
Turbo / EFI U20 (T25 w/ SDS EMU.)
Turbo / EFI U20 (T25 w/ SDS EMU.)