Re: Insulating my exhaust pipe.
A fiberglass cloth might work pretty good. I have some fiberglass welding blankets that are very very resilient to heat. You can put a propane torch directly on it and it just glows red, remove the torch and it looks like it never happened. I would think that the fiberglass cloth sold in hardware stores and automotive stores might work similar. I have never tried it, just a thought.
Caution! I give opinions as if they were worth something. Use at your own risk.