temp paint...

one of the problems I have is rust, this is why I am wanting to just get something on there. I would like to go down to bare metal, but I have read some things that say you don't always have to. this is kind of why I am asking the question of what I can use to paint with. I don't want to put any time into pulling the parts cleaning them up and then having to do it all over again because the new paint doesn't work with the old paint.

I have a feeling you guys are going to tell me to just go ahead and paint the parts with the stuff I plan to paint the car with in the end...am I right?

if so what do y'all recommend?