weld thru primers?

I have used it couple decades ago, I clean the metal I will weld good cleaned metal, plap disc ed, cleaned it with phosphoric acid sol. I read about the weld thru primer stuff now, is it anything more than a self etch primer???? Welding the wheel opening and the inside edge of outer wheel housing. 62 Lancer! (of all things!) ha
THIS is HER car, and it better look good till one of us kicks the bucket!