Gun gum / bandage on exhaust

[Riley26]

I plan on repairing my exhaust with gun gum as a temporary measure. It is only a small leak. Can gun gun be used with a bandage. I. E gun gum on first then the bandage. But does the gum gun need to set first? Thanks.

[blue_haddock]

No if anything they probably work best when used together. Seal with gun gum and then wrap with bandage to stop in moving and damaging the patched bit

[dontlookdown]

Go for it. This was my repair of choice back in the day when exhausts were made of tin foil and rusted out in a year or so.

[Josho]

Scrap the gun gum and use red high temp silicone, miles better.

[Limpet]

If the hole is on a pipe rather than on a silencer, I've never found anything better than a Coke (or beverage of your choice) can with the ends cut off, slit lengthways, and slipped over the pipe with a smear of gun gum, and a clamp at either end

Never got the bandages to stay put beyond a couple of days.

[Aiminghigh123]

Limpet said:

If the hole is on a pipe rather than on a silencer, I've never found anything better than a Coke (or beverage of your choice) can with the ends cut off, slit lengthways, and slipped over the pipe with a smear of gun gum, and a clamp at either end

Never got the bandages to stay put beyond a couple of days.

Yep same here. If it’s on the silencer I find they don’t last long.

[Riley26]

Thanks would you let the gun gum set before applying the bandage?

[MB140]

Aiminghigh123 said:

Limpet said:

If the hole is on a pipe rather than on a silencer, I've never found anything better than a Coke (or beverage of your choice) can with the ends cut off, slit lengthways, and slipped over the pipe with a smear of gun gum, and a clamp at either end

Never got the bandages to stay put beyond a couple of days.

Yep same here. If it’s on the silencer I find they don’t last long.

As a kid my nova exhaust was more baked bean cans, jubilee clips and exhaust sealant than actual exhaust.

Best solution is as described (assuming it is on a straight bit of pipe.

[Rozzers]

Gun gum, can over the top, jubilee clip, then go for a drive to get it really hot and it sets rock hard. Many cars back in the day had several of these on the exhaust and no doubt a wing or cill patched with a Castrol GTX tin or maybe one of those Lyons Maid ice cream signs that used to stand outside shops....

[dontlookdown]

No don't let it set first. Do it all at the same time

As previous poster said. If it's on a straight bit of pipe an opened out tin can and a couple of jubilee clips works well over the gun gum.

This is an old school 20th century fix, but it works. There may well be more more up to date options - I haven't actually bodged an exhaust like this since about 1995;)

[A1VDY]

As long as the repair isn't on the hottest part of the exhaust ie the downpipe, P40 fibre glass works better than all the exhaust bandage /paste Bodges..

[E-bmw]

A1VDY said:

As long as the repair isn't on the hottest part of the exhaust ie the downpipe, P40 fibre glass works better than all the exhaust bandage /paste Bodges..

Don't be tempted to do this it WILL melt if you are lucky, burn the car to the ground if you are less lucky.

[matt0677]

I've bandaged an exhaust like this before (gungum then bandage, steel cable-ties all in one go) and it went through the mot. As said, get it hot to help the gungum to set.

I think the bandage is more important because the tester can't see what it's hiding? Do they use some sort of sniffer to find leaks?

[E-bmw]

matt0677 said:

Do they use some sort of sniffer to find leaks?

Not as such, but a gas analyser (used in emissions testing) can detect leaks bad enough to pull air in.