Exhaust high temperature silicon sealant

[Paul Deslandes]

Can anyone recommend a readily available hi temp exhaust sealant.  This is for a non 7 classic car with cast iron manifold and stainless pipes.  The seals don't seat well enough to seal properly as the manifold interface is pitted.

I have some Hondabond HT which is a bit too runny and wondered about intumescent flue sealant.   There's no cat or lambda sensor to worry about.

I've tried the archives but the links don't work.

Thanks

Paul

[Mark Durrant]

Paul

I have used Permatex Ultra Copper to seal leaking primaries and found it to work well.

[SM25T]

There is an orange loctite high temperature silicone sealant too.

[Jonathan Kay]

I've tried the archives but the links don't work.

How about this?

Jonathan

[Nick Bassett]

I have used Loctite RTV 5990 on my exhaust manifold gasket - good stuff and also used by DVA too :-)

http://www.halfords.com/workshop-tools/garage-equipment/head-gasket-exhaust-repairs/loctite-5990-premium-silicone-copper-gasket-maker-sealant

[Delbert]

do not use an intumescant as when it get sto 170 degrees it will expand beyound belief 

 

That is why it is used around pipe pentrations in fire walls 

[Paul Deslandes]

Thanks for all the replies.  Off to Halfrauds for some 5990 as it's readily available.

Didn't know that about intumescent - glad I asked!

I'll try that search method in future JK.  Pity that it's not built into Blatchat search.

Paul

[NeilCSR]

Used Permatex Ultra Copper on bikes exhausts over the years and it's excellent.

Neil