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Coeur d'Alene, Idaho
 
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Glue suggestions for underhood insulation?

I have a new hood insulation set to install. anyone have suggestions for a product to use? I'd rather use a spray than deal with brushing it on such a large surface.

Doug
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Old 08-28-2017, 10:56 PM
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3M has a heavy duty spray adhesive that worked well with these hood liners. If I recall correctly, it was a $15 product available at most all auto part chains.
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Old 08-29-2017, 03:11 AM
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Of course, for what it's worth, Porsche did not use the hood insulation (actually sound reduction material more than heat insulation) on the very late 944 cars. My tendency would be to leave it off.
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Old 08-29-2017, 03:22 AM
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If you have old insulation, use a plastic scraper and be sure to cover the engine bay - that old stuff goes everywhere. I used a 3M spray - surface prep is the key.
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Old 08-29-2017, 03:36 AM
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Quote:
Originally Posted by 944 Ecology View Post
Of course, for what it's worth, Porsche did not use the hood insulation (actually sound reduction material more than heat insulation) on the very late 944 cars. My tendency would be to leave it off.
Wow - I'd love to tear that stuff off, if I knew the good would be perfectly safe ....

If it were for only for heat, the hood would warp then?

... if it's only sound, that'd make some sense because the stock sound absorbers can be foamy...

... then again, some are very dense rubber, like in the spare tire well...

... beware that 3M adhesive line - one of them really was lousy in my opinion... needs to also stand up to heat ... perhaps look into the DAP Landau Top adhesive? Never used it...
Old 08-29-2017, 04:22 AM
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The insulation I bought from a popular vendor was "peel-and-stick." Let me tell you...if you have this kind, double, triple check everything is lined up where you want it because once the adhesive hits the metal...it's there for good! Also, I had to make sure my power steering fluid reservoir was properly sitting at its lowest point in its metal holder or it would "hit" and compress the foam insulation.

And yes, prep is key. Make sure every bit of the old adhesive is off. I used a combination of a heat gun, the stronger Goo-B-Gone product, and several plastic scrapers.
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Old 08-29-2017, 05:18 AM
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Coeur d'Alene, Idaho
 
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Good tips - thanks. I haven't opened the package to see if its peel n stick. That would be nice. I will lay a sheet of plastic over the engine - thanks I would have been a dummy and got started and then had a mess and laid sheet later.
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Old 08-29-2017, 07:22 AM
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I'm prepping a new hood for my car right now and I was thinking of insulating it. Where did you get the insulation from if you dont mind me asking?

I need to be able to modify it unless they happen to sell a set for a 931.
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Old 08-30-2017, 02:35 PM
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Ah, crap - can't help you on brand. I bought the car from my Dad and it came with it uninstalled. He says its at least 10 years old and he took it out of the packaging to send it over a few days ago. Its beautiful - a lightweight rubbery black foam 3/4" thick with a thin aluminum layer toward the engine and a peel and stick against the hood. I think it also has a cutout for some component that gets close - perhaps the PS res mentioned above. Whoever made this, it looks to be quality construction and engineered materials.
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Old 08-30-2017, 07:49 PM
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Quote:
Originally Posted by 944 Ecology View Post
Of course, for what it's worth, Porsche did not use the hood insulation (actually sound reduction material more than heat insulation) on the very late 944 cars. My tendency would be to leave it off.
...and then they had a TSB on ignition wires arcing to the hood and causing misfires
Old 08-30-2017, 10:10 PM
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I bought my liners from Robert Budd. They have been on my car for 10 years and still look good.

Porsche hood liner Sound insulator

or Ideola"s Garage: http://garage.ideola.com/prod-Appearance.html- Dan Becket can help you too.
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Old 08-31-2017, 03:31 AM
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I just replaced the hood insulation pads on my late 944 NA with these, and they turned out very well:

Hood Insulation Pad 477863771 - O.E.M. - Porsche - 477-863-771 | Pelican Parts

Hood Insulation Pad 94455677201 - O.E.M. - Porsche - 944-556-772-01 | Pelican Parts

For me, the key was removing all of the original glue residue before installing the new pads. To do that, I soaked the old glue with Goo Gone citrus spray, then scraped it off with a plastic paint scraper bought at Home Depot. Then, I wiped it down with isopropyl alcohol to ensure that all residue was removed.

Once it was cleaned up, I sprayed the hood with 3M Hi-Strength 90 spray adhesive, peeled off the protective backing from the pads, the carefully pressed them into place. So far, it has held up perfectly.
Old 09-15-2017, 08:28 PM
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Quote:
Originally Posted by Guanciale View Post
Once it was cleaned up, I sprayed the hood with 3M Hi-Strength 90 spray adhesive, peeled off the protective backing from the pads, the carefully pressed them into place. So far, it has held up perfectly.
Hi:

I have a couple of follow-up questions. 1: Did you mask off areas on the hood where you did not want the adhesive to go. 2: When you pressed the new material on to the hood, did you need to hold it in place while the adhesive dried or did it just stick in place. 3: How long did you wait after putting on the insulation before you closed the hood and and then drove the car.

Thanks
Old 08-07-2018, 05:22 AM
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FWIW as mentioned the later model years didn't even get the pads, they were for noise, not heat.

I haven't had the pads on my car in a decade, no issues with warping or paint failure, and the car gets driven regularly at 100F ambient on top of engine heat.
Old 08-07-2018, 07:49 AM
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