Heat Wrap, good or bad?

[Fostang]

I used the wrap for a while on two different cars. They were both the same brand name headers. Only difference is that I ceramic coated the set for the fastback and for the torino just left them painted black. The torino headers began to leak from a hole they developed but the fastback ones were still good as new when I took them off. Go figure? I'd at least use it around the starter.

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67' Fastback-Mean Temper
67' Coupe Under Construction
70' Torino Cruiser
84' Svo Original