Paint bubbled months later-how to prevent??

As per PurpleHaze, Etching-primer is a must. "Whats dat?" Etching-Primer is slightly acidic so it will etch itself to the bare metal. Otherwise, your primer,paint or whatever wont adhere properly and you'll blow it off at the car wash. Spend the $ on material, take your time and good luck. Oh yeah, move. Painting is so much easier at 78 degrees (82 yesterday)