Works well on uncoated headers, does trap moisture if you get the cheap stuff so it may rust thru on a car thats not driven every day. Have also heard a bit about the tendancy for welds to fail prematurely.

Best thing goin is getting a new set of pipes, have em ceramic coated inside and out. Keeps the temps down & if you still have heat issues you can wrap them w/o damaging the header.

The easiest way to wrap is to take me out, doin em on the engine is a royal pita.