I have Jet Hot coated mufflers and headers on my Guzzi Lario. They did an awesome job (I now have to get the bike looking as good as its Satin Black exhaust!). The finish is holding up extremely well after 3 years - although the bike does live in a heated garage. However, 5 min after riding, the pipes are just warm to the touch, so there is not really a chance for massive condensation to form.
Jet Hot is great, because it coats both the inside and outside of the headers and Cans, so corrosion is not really a worry. Also, they have some sort of cleaning process that cleans out the inside of the
736 - what about repairing the rot holes and then jet coating them? Would a muffler repair shop be the right person to go to?
Thanks,
Gersh