Silicon Sealer before cat?

[Rusty]

Is this a no-no? Alternatives? Ta

[driftin jo]

you can get special cat safe stuff

[mcandmar]

Silicon Sealer anywhere on an exhaust system sounds like a bad idea to me. I always use gun gum to seal any slip joints on exhaust systems.

[diesel des]

I always used to use fire gum or what ever it's called until I found out a local exhaust place used silicone after the lambda. So I tried it and it works well!

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[Rusty]

Cool, cheers. Silicon works well elsewhere so will get some cat safe stuff.

[LSG]

Andy hi at Big cc we use silicon on turbo headers to turbo all the time. Its specially made for exhausts, it doesn,t go hard and blow away like fire gum and it will easly cope with the heat. The stuff you should have a look at it Loctite ultra copper exhaust silicon 5920. When i get in to work tomorrow i,ll check that numbers right. Two week,s ago we had a few bolts seized so we used the oxyacetyiene to free them up and to our surprise the ultra copper silicon hadn,t burnt away.Anyway see what you think chap. Regards Lynn.

[Monkeymagic]

Wynns do a specific gasket maker for this purpose. Its great on exhausts cos it doesn't completely harden.

[Rusty]

Excellent, I already have some 5920 in the toolbox

[LSG]

Hi Andy had a look at that number and it is 5920. Great news you have already got some in your tool box. Just to let you no that the ultra copper stays rubbery it doesn,t harden. .Regards Lynn.