Not exactly. First off, mine were very used, so I figured they had shrunk as much as they would and were safe to weld. Second, I mounted the headers and welded them on the car so they would fit perfectly. I reused the old gaskets at that point, and used new gaskets on final install. Then I sanded/wire brushed them until clean and coated them myself with spray header paint. It's suppose to have ceramic, but I dunno. I just wanted to protect them from surface rust under the wrap. I coated with about 6-7 coats, cured fully, and then wrapped. Coated the wrap with silicone header spray another 6-7 coats. After 300 miles of running around in rainy conditions without the belly pan they still looked the same as when I installed them. Hope that helps.
AEM CAI, Perrin ELH wrapped, Catted Downpipe, Stage II XPT tune, K4RT30Y STS, lip, shark fin