Ted - re exhaust wrap, I've been using it on the exhaust of an old 60's Lotus for the last 15 yrs, trying to stop manifold heat splintering the glass fibre bodywork.
Each application lasts about 2 - 3yrs before it falls off bit by bit but I've never noticed any parts of the car going up in flames (and with Lotus's build quality in the 60's putting out flames is part of the maintenance schedule  ).
What I have noticed is the wrapped part of the exhaust corrodes badly. My guess is that the stuff holds moisture - either from rain or condensation or wherever and the metal rusts away out of sight. On a bike it's likely to spend a lot of time wet.
The other thing is that it doesn't stay that nice sandy, rally prepped colour for long. Rain, dirt and heat turn it into a colour close to the rust that's forming underneath. Use it for your SA trip but stick to paint for the UK
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