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Using red RTV gasket maker instead of a real gasket when replacing thermostat? #5078242 04/17/19 09:14 PM
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PotatoFarmer77w Offline OP
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Hi all,

I have some left over Permatex High-Temp Red RTV Silicone gasket maker when I replacing the rear diff cover few years back. Now I’m going to replac the thermostat and just want to know if I can use this stuff as a gasket for the housing. On the package and the website it’s “recommended for thermostat housings” but I just wanna double check to make sure. The vehicle is a 95 Chevy k1500 with the 5.7 v8



Here’s the link:
https://www.permatex.com/products/g...matex-high-temp-red-rtv-silicone-gasket/

Last edited by PotatoFarmer77w; 04/17/19 09:15 PM.

1995 Chevrolet K1500 5.7 v8
2007 Ford Ranger 2.3 I4
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078256 04/17/19 09:28 PM
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Snagglefoot Offline
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Not a problem. Make sure your bead size is what they spec and follow the directions. Make sure the surfaces are totally clean. smile

Last edited by Snagglefoot; 04/17/19 09:29 PM.

If you want the job done right......do it yourself.
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078257 04/17/19 09:29 PM
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Chris142 Offline
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Clean both parts so that there is no oil. Put your goo on and finger tighten the bolts. Let it sit a few hours then final tighten them and add your coolant.

Works well. Many new cars dont use a gasket for things like this. Just goo as you described.


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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078279 04/17/19 09:50 PM
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Kestas Offline
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I prefer to make my own thermostat housing gaskets.

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: Kestas] #5078288 04/17/19 09:58 PM
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spasm3 Offline
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Originally Posted by Kestas
I prefer to make my own thermostat housing gaskets.

Thats pretty cool! Share how you do it!


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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: spasm3] #5078295 04/17/19 10:10 PM
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MParr Offline
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I’ve made thermostat housing gaskets out of the cardboard box the thermostat came in. You cut the box a bit larger than the housing. Take a small ball peen hammer and lightly tap out the cardboard while holding it to the housing. This gives you the perfect outline to trim by.


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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078299 04/17/19 10:12 PM
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Kestas Offline
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It's rather easy. Trace the thermostat housing on gasket material and cut. Gasket material doesn't have to be anything fancy. You can use thick paper material sometimes used in packaging or even milk carton material.

Beats running down to the store and paying 50 cents.

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078354 04/17/19 11:35 PM
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Reddy45 Offline
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You could use the cardboard box to make the gasket, and then keep some Indian Head shellac on hand to waterproof the paper before using it as a gasket.

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078360 04/17/19 11:58 PM
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Snagglefoot Offline
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The OP was asking if red RTV gasket maker can be used as a gasket on a thermostat housing. Yes it can. smile


Last edited by Snagglefoot; 04/18/19 12:03 AM.

If you want the job done right......do it yourself.
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078385 04/18/19 01:47 AM
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nthach Offline
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It'll work - as long as the silicone is still dispensable and it "kicks". No Dex-Cool or "all makes all models" coolant of course...

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078407 04/18/19 03:31 AM
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Superflan Offline
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I did make a gasket for an integrated thermostat housing (plastic so) bolting on aluminium engine. Using red silicone. I tightened right after applying and filled the circuit 2 hours later and went for a drive. It's been 7 months and 7000 miles and no leak so far!


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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078408 04/18/19 03:32 AM
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Char Baby Online Content
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My BIL(48 yr diesel tech) always said that...you can't buy a gasket as good as what you can make with RTV.


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Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: PotatoFarmer77w] #5078419 04/18/19 04:05 AM
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Lubener Offline
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For a small cost, I would do it right and get a gasket.


The "thinking" man's friend.
Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: Lubener] #5078425 04/18/19 04:36 AM
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demarpaint Offline
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If a gasket is available I'd buy one and use it, if not I'd make one. The RTV gasket maker I'd use a last resort. Opinions vary.


God Bless Our Troops

Re: Using red RTV gasket maker instead of a real gasket when replacing thermostat? [Re: Kestas] #5078433 04/18/19 05:10 AM
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dlundblad Offline
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Originally Posted by Kestas
It's rather easy. Trace the thermostat housing on gasket material and cut. Gasket material doesn't have to be anything fancy. You can use thick paper material sometimes used in packaging or even milk carton material.

Beats running down to the store and paying 50 cents.


What material do you use?

And yes, you bring a really good point.


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