One of the brands of exhaust wrap i used was crap. One lasted great, the other went like glass and fell off after one track day. It became very brittle. They were both from Revolution Race Gear, only one was a different brand and was wider. I later tried the brand that didnt go brittle on the whole manifold and it last great until i removed it when i removed the turbo after about 18 months of service.
The reason i decided to try the wrap was the ceramic coating didnt reduce temps anywhere near what i was led to believe, the difference was marginal, but still better. Main reason i liked it was for its treatment of the metal itself and the small difference it would make to the differential temperaure the steel would see. Ie one side hot the other cold (engine bay air)
I found the combintation of the two worked really well, only the wrap still gets changed when the setup comes off the engine every now and then for maintenance purposes. So liek i said these days its easier to just remove/re-install the shield i made