home ceramic coating headers ??

Use the best in the business: Cerakote.

This is the most popular, Glacier Black.
Cerakote - CERAKOTE GLACIER BLACK

There are MSDS and application tips as well which I encourage you to familiarize yourself with.

Basically you need:

A means to blast the metal for the best adhesion;

Wash and dry it thoroughly (don't just blow it off with compressed air, as that leaves dust residue);

An HVLP gun with a .08 mm tip;

Wires or hooks to suspend the parts for 360 degree access (you can also dip them if your tank is large enough).

The only expensive thing about ceramic coatings is the cost of the ceramic itself. A 4 ounce Tester is enough for a set of wheels and will likely have leftovers (returned to the bottle by the way) ... you can also buy a bigger bottle and get everybody in your car club who wants their headers and manifolds done to pitch in, splitting costs and helping prep while allllll saving a $hitload of money.

It dries to the touch in under an hour usually, and then cures in open air over the next 5 days whether it's still hanging on wires, laying on the shop floor or installed on your car. It's good to about 1800 degrees. Wrapping it with exhaust wrap is how you void the warranty.

Check it out! You'll be happy with it.