Every set of headers I've had, I bought them ceramic coated from the manufacturer. I've had TTI, Hooker, and Patriot headers. They all rusted somewhat after a few years.
Never heard of the WD-40 treatment.
Next time I'll try a coating from someone like Jet-Hot.
The ceramic coating is still way better and more durable than any header paint I've seen.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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