I looked it up and 409 turns red from heat but doesnt rot out like regular steel except when covered with salt water where it will slowly pit.
The exhaust wrap companies sell a high temperature siicone spray paint to seal the wrap up. For extra protection i'm going to use that to seal the pipe first , then wrap and seal the wrap.
What i wonder is if the wrap fibers stick to the pipe or if they rub the metal with the heat and vibration cycles. If they do the latter then the underneath coat would wear away and maybe a high temp coating of antisieze or lubricant would be a better barrier than paint on the inside.
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