I always have m frames blasted to bare metal before applying POR15, but more importantly, thats the least expensive Powder I've ever heard of!!!! Prices here are so much more around these parts it'd be worth me shipping parts to your coater!

Below are the prices for Doug's headers, pRaw and Ceramic Coated:

D626-R Raw Header Ford Mustang (67-70) Click for applications
Item is available.
USD$ 476.76

D627 Coated Header Ford Mustang (67-70)
Item is available.
USD$ 1,100.93

That $600 for the COATING - so if you can get it done for $65 I say you should go into business as the middle-man!

A quart of POR15 is about $40. That's enough to do an ENTIRE frame and the ENTIRE underside of a vehicle - twice....