Really disappointed with the workmanship, as they are still pitted & blistering
I suppose I 'really lucked out' on my 64 tail light housings. Had three sets, all badly pitted, cracked, or both. For the cost, repairing, or find others, I located some pull-offs in Arizona. Like new, not cheap, but got 'em anyway. Cost to repair ran the same $s.
Don't know if it's EPA related...but, my understanding is, after all the corrosion is removed, should be copper flashed. With that, the pits are filled in, shaped until smooth, final copper flash if needed. Then the chrome.
Though, admit, it takes a good hand to polish out the chrome, or it can get screwed up.
Had one vent window frame, repaired, re-chromed, and screwed up, by the polisher. He polished out all the detail edges on it! Luckily, I had a spare, and used it.