Exhaust preservation

hi what car do you have?

Is it a petrol or diesel?

Petrol exhausts tend to rust from the inside out particularly if the car is used for short trips. Water is produced by the engine in the exhaust and rots it out if not warmed up often. Not much you can do to stop it apart from buying a new rear box.

Diesel back boxes seem to last years, mine is 15 years old and still solid.

It may be just the heat shield, I was getting MOT advisories for a few years on mine. Thought it need a new back box but only needed to remove what was left of the heat shield.

What do you mean by peeling? nothing has rusted through I presume

Not sure how hot the rear box on a petrol gets. You could try putting some metal paint (like Hammerite) on the uncovered metal or shoving some epoxy resin (Araldite) on it. But not sure how they would react to heat.

The only other thing I can find of is a some metal banding strips warped around the box to hold it together.

Get hold of some high temp spray paint paint, Toolstation do one at under £7. A tin of engine enamel might be a tougher coating.

It is good for 650c so well within the backbox range. Only thing is you may need to redo every so often due to the abuses of road debris and water.