Standard aluma-ceramic coating doesn't really insulate the heat, it aids in dissipating it quicker but it really needs air flow to do that. The idiling in traffic or when you shut the car off is likely when the melting is going on. The only coating that is going to offer any insulating qualities is a full ceramic but it's twice as much money to do. If your going to put wrap on the headers only wrap it in the area where you need it, wrap holds moisture and heat so it will ultimately ruin the coating and header. I would try to make a heat shield and see how that works out.
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