Permatex ultra red high temp gasket maker

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Has anyone tried this Permatex Ultra Red High Temp Gasket Maker? It’s rated to 650*F like the stuff they are sending out in the new XR kits.

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4200 or 5200 is our recommendation. We know it works. Science experiments may work or may not. Just my old fart option.

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Hey John, thanks for the opinion. I’m building the XR right now and was looking at the tube of RTV they sent with the kit. What stands out to me is it’s rated at 300* C. I’ve given the 4200 serious consideration, my only concern has to do with the high temp rating on what Langmuir provides, which is 300C, and the Permatex is the only one with that same rating. I would like to find out why Langmuir hasn’t changed their recommendation over a lot of years of water leak complaints to include a list of options. I can’t even find the stuff they sent me online. It has a lot of either Chinese or Japanese letters all over the tube. So far the only thing that makes sense to me is the 300C rating. I don’t want to experiment, just don’t want to have to chase leaks and do this twice. Terry

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Just my two cents: A plasma stream can approach 45,000 degrees F. There is no caulk that will survive that blast. It is the water that makes the temperature not as much of an issue. If you are expecting to cut lots of thick steel (3/4 inch and larger) you would probably want the seam welded.

I used 5200 on my seam after it was already assembled and I thought leak proof. It started to develop a leak. Added the 5200 (gooped it on the seam topside and bottomside of the pan). I have cut 1/2" steel but not that much. No leaks for more nearly 3 years.

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i used the 3M marine fast cure 5200. applied it about 4 years ago and hasn’t had 1 leak yet.

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Please understand that 5200 is unlike the silicone you have seen before. It is very soupy and takes 24 hours to start curing correctly.
It will not be possible to take it apart again, and it will be very difficult. However, it is by far the best option.

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Welded, deeper pan, taller slats…Ask me how I know.

It’s more of a 80-100amp plasma cutter issue.

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