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[4x4]

After finally getting exhaust sorted and changed today,the fitter commented i had a blowing joint on the cat to middle box,ive done this joint several times and it still didnt seal correctly,so the fitter told me to use a high temp rtv silicone,i finally decided to do it an hour ago as was bored,checked the rtv i had was useable upto the higher temps and it was,so redid joint using rtv and it worked a treat,exhaust leak free system now,top tip for the day 

[Stallion]

Nice one 

[Nick W]

Ordinary clear silicone works on exhausts if you're in a hurry. Or a bodger. Or just cheap.
It's got to be clear though, as the pigment in coloured silicone is what burns.

[biggriffin]

After finally getting exhaust sorted and changed today,the fitter commented i had a blowing joint on the cat to middle box,ive done this joint several times and it still didnt seal correctly,so the fitter told me to use a high temp rtv silicone,i finally decided to do it an hour ago as was bored,checked the rtv i had was useable upto the higher temps and it was,so redid joint using rtv and it worked a treat,exhaust leak free system now,top tip for the day 

o dear wait for the abuse and derishion, from some. Ive said about silicone for years,but been called names.

[Webby the Bear]

Silicone shouldn't be used BEFORE the cat cos silicone and o2 sensors don't get along.

After thecat though no problem.

I got the black RTV and will give this a try as I cant get mine to seal properly either 

[omega3000]

Ordinary clear silicone works on exhausts if you're in a hurry. Or a bodger. Or just cheap.
It's got to be clear though, as the pigment in coloured silicone is what burns.

Black smoke from underneath the 4x4 for a while then 

[Sir Tigger KC]

I always make a mess with silicone..... 

[biggriffin]

I always make a mess with silicone..... 

Anything long and soft you make a mess with. I find a moist finger helps.

[05omegav6]

I always make a mess with silicone..... 

Anything long and soft you make a mess with. I find a moist finger helps.

Wipe on, wipe off...

[TheBoy]

I've had a lot of luck with that exhaust repair paste (the stringy stuff, not fitting paste) that is dirt cheap on Halfords trade. It won't hold where a pipe has rusted off the box, but if its that bad, it needs a new exhaust anyway.

If its a poor fitting at a tapered joint, its either poor fitting, or incredibly poorly made exhaust. These should only need a small smear of fitting paste, but must be on the taper, not applied after fitting together.