Hi,
If you are referring to the graphite spray coating I used on my cast exhaust manifold, it works okay. Easy to apply and looks great. Here's photo from when I first did it three years ago.
Now, 2,500 miles later almost all highway miles back and forth to Powerland and Oregon shows from Seattle and an open track day at Pacific Raceways
Easy to reapply and make nice again - if you clean your engine regularly, it's a simple wipe on touch up. This is ±20 second reapply using a tissue and one finger.