Just another real world experience; my original valve covers were blasted and in etch primer when I received them. From there, I had a small dent in one of them. I actually used filler on the dent and used RM filler primer that you would use on body panels, block sanded them and then shot them with Mopar rattle can. They've been done for around 4-5 years and I've had no issues; the combo has been very durable.