I didn't want to hijack any other primer threads so I started this new one:
What kind of primer would I use just to protect from rust while I'm doing my body work? I'll be doing it a little at a time as funds permit and running the truck in primer until I have it all done. Some of the primer will be over bare metal, some over filler and some over old paint that has been sanded for better adhesion. I'm new at paint and body work and I have a couple of cheap sprayers to get started with.