Rustoleum Automotive Primer Spray Painted A Spot On My Truck With Aerosol Cans It Had Little Bubbles On It Less Then 2 Weeks Later?

Spray painted a spot on my truck with aerosol cans it had little bubbles on it less then 2 weeks later? - rustoleum automotive primer

Sand it, as if nothing went first does not even seem to metal stick. He had a body that is full of rust on my defense of sand to bare metal, then Rustoleum first car, and red DupliColor and clearcoat. Is it necessary to use the same brand for all 3? This is the first step is good, or simply spray paint all