Hi John, I have used Barbeque Paint in the past on an old exhaust and it works a treat. This stuff was purchased from B+Q ( a handy man store) in the UK. It comes in a spray tin and is used to repaint a well used metal barbeque set. This paint is very high temp specific stuff and is long lasting. It is also much cheaper than the cost of an exhaust specific ( car spares) paint...
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Hmmmmm!