Depends where you order them. Most places you order from are just going to have an anti-rust coating on them. I don't know if nowadays that also doubles as a primer, but it didn't used to. Years back when my grandfather was replacing the bed and rear sides on his truck he got everything coated in a black coating that had to be stripped first otherwise the paint would flake off. However late last year when my buddy ordered a new door for his ranger the black coating looked and felt a lot like primer, it was just a tad darker in color.