I have always scuffed and epoxy prime ( or sealer as I and other like to call it) and paint. Anytime I do not know what the product is made from I will use DP40 epoxy primer first. I have been using PPG products for close to 25 years and my father has been using them for longer than that. Any issues I have had have been from me and not the product!
Scuff. Prime. Paint. Done. Move on to something else!
So are you saying that if we can nearly scratch the Chinese black paint off the patch panels with our finger nails, it would be fine to scuff and prime? I know epoxy primer is tough, but if the mystery paint underneath it comes off that easily, I have visions of the final paint coming off in sheets. It would only be necessary to remove this Chinese paint from just the patch panels. Not a big task.
