header wrap? pro's / con's

ied that
The biggest issue is not holding in heat, but holding and collecting moisture. If you are lucky enough to live in an environment where humidity rarely gets over 30%, then you don't have issues. Humidity here stays around 50% or higher, so moisture is a problem. If you don't think wrap holding moisture around your headers will make them rust, you got another thing comin. Good luck with it though.

I`ve had wrap on 3 diff. cars headers. I have seen 100% humidity here and it not raining (was a few yrs back ), and have had wrap on 3 diff. cars, and had no rusting or cracking problems. I figure the cracking problems u guys are having is coming from cheap headers. What is this silicone spray ur talking about, never heard of it ?!? Of course there`s a lot I haven`t heard about !