I own a ’69 AMC Javelin that is currently wearing its second coat of paint – soon to be re-done. At the seams where the roof meets the rear support pillars, the paint is bubbling slightly (both sides). I have been told that this happens because the seams were originally leaded and the acid in the flux finally leaches out and causes the paint to blister. I was wondering if a good plan would be to grind down the surface, coat it with “Rust Encapsulator”, and fill and smooth it with “Evercoat Metal-to-Metal”. Sound right? If not, which other products would be best? Thanks.