Best way to remove surface rust on sandblasted sheet metal

Here is where I use Ospho a lot. The insides of doors will have at minimun, surface rust. Yes it would be great to pull the doors, take out all the glass and tracks, send them off to be blasted with a non worping method, but......I clean off the loose rust, use Ospho, let it dry a full day, use Rustoleum enamel over it, or second coat of Ospho, wash it off with water while still wet,. epoxy prime or Rustoleum. Sealed great. Other areas like the insides of door are the inner wheel housings, any inner structure that can not be sanded down to clean, bare metal.
I don't like rust!