For what it's worth guys I have had my GT40 headers recoated 3 times and it has never stayed shiney for long. It goes dull especially near the heads. I now just scuff them with a scotch pad them spray them with this stuff.
http://www.duplicolor.com/products/engine.html
This stuff is way easier to touch up and it looks really good
If you are doing this for a lower surface temp, then I think you need to get out the Temp laser and see for yourself that there is not that big of a difference.
I'll not pay to coat another set as long as I can get this stuff.
Hersh
