Trying to fix a rusty wheel arch. Removed all rust, Filled pits and epoxy primed. Sanded primer up to 1000 grit and sanded whole panel also to 1000. There seemed to be a perfectly smooth transition between the epoxy primer and existing paint however after base and clear I can still make out the transition. It's imperceptible but it's there. What am I doing wrong?
Before and after photos. The before wasn't the finished article
Before and after photos. The before wasn't the finished article