I can tell you that the Splash Zone on my heads with E85 only lasted about a year before the majority of it came off at the pushrod pinch. It wasn't any better then JB weld was.

I just tried it again, but this time added a top coat of KBS Gold Standard Tank Sealer.

http://www.summitracing.com/parts/kco-5200

It is supposed to be E85 resistant, so we'll see how this goes....