High Temperature RTV; which one??

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Bill Everett
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High Temperature RTV; which one??

Post by Bill Everett » Fri May 31, 2019 2:51 pm

This picture was posted in an earlier topic. I have some pitting on my block, and I want to get some of the High Temperature RTV that's mentioned in the post where this picture was.

What High Temp RTV should I get? If you have a picture of the tube, please post it.

Thanks.
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Model T Manifold Gasket RTV.jpg
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Re: High Temperature RTV; which one??

Post by Jim Sims » Fri May 31, 2019 3:06 pm

You will need to get the copper RTV.


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Re: High Temperature RTV; which one??

Post by rgould1910 » Fri May 31, 2019 3:10 pm

There are a number of exhaust manifold sealants advertised on the net. Personally I don't trust the stuff. Better option is to mill the manifold and inner ring surfaces smoother.

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Re: High Temperature RTV; which one??

Post by CudaMan » Fri May 31, 2019 3:26 pm

The Ultra Copper. The high temp red isn't high temp enough. :)
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Re: High Temperature RTV; which one??

Post by Steve Jelf » Fri May 31, 2019 3:59 pm

That's my pitted block in the picture.

IMG_3546 copy.JPG
I used this Permatex product. It's fine. It seals, and when I removed the manifolds after almost three years of driving (including Detroit and back) it was unburned. The label says red, but as the first picture shows it's closer to orange.
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Re: High Temperature RTV; which one??

Post by SurfCityGene » Fri May 31, 2019 6:22 pm

Permatex brand is important and red or copper should be ok. There is a new Ultimum Grey the is good for 700*F. Others are still close to 650*F and like Steve said his worked fine. The Red was first colored one we used to use then a copper pigmented one came out later and now a super Grey one... I believe sort of like the Green differential oil one that to me is sort of a advertising event to sell more. Next will be one for each different part of the car.
Permatex makes some of the highest quality products and my Favorite being the amazing Ultra Black. I just ordered a large quantity for just under $5 bucks each! I pass on the savings to other club members.
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Re: High Temperature RTV; which one??

Post by Steve Jelf » Fri May 31, 2019 10:28 pm

...my Favorite being the amazing Ultra Black.

I love Ultra Black. But I learned to buy it in small tubes. If you use part of a large tube the rest will be set up by the time you need it.
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Re: High Temperature RTV; which one??

Post by SurfCityGene » Tue Jun 04, 2019 2:13 am

Steve, I'm not sure what you mean by a Large tube but commonly guys here use the 3.5 OZ tubes which is more than enough for most all jobs. We've had pretty good success with using the supplied tip and taping over the end when finished. It has always been pretty easy to later unscrew the tapered applicator if you need to apply more to a different job. The RTV activates from the moisture in the air so it's best not to leave it exposed any longer than necessary.
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Re: High Temperature RTV; which one??

Post by Steve Jelf » Tue Jun 04, 2019 9:22 am

...not sure what you mean by a Large tube...

That would be the 3.35 ounce size. I carry a couple of half ounce tubes in my tool box. They're not sold everywhere like the larger size.
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Re: High Temperature RTV; which one??

Post by ChrisB » Tue Jun 04, 2019 10:24 am

Small size Steve mentioned

Permatex Grey .5.jpg

Their sales blurb

Outstanding oil resistance and joint movement tolerance. Eight times more flexible than cork/composite gaskets; three times more oil resistant than conventional silicones. Temperature range -65ºF to 500ºF (-54°C to 260°C) intermittent; resists auto and shop fluids and vibration.
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