Body work question

I am not to good of a body work guy or even a painter but,do the best I can.I have the maverick I am working on and it has some rust on the doors on the bottom and on the under fenders.I was wondering if anyone has used something called osfo(I think thats the name of it from sherwin williams paint store)Or is there something I can use that will kill the rust and keep it from spreading?thank yall for your time and patience with me on this.kenny

 

Ospho will neutralize rust...It works well.

 

Thank you for the help-looks like I am sherwin williams bound.

 

Just be certain to clean the area treated, well... Then be sure to coat the area with a good epoxy primer followed by a good top coat, so moisture cant get to the steel again.

 

I will sure do that,I owe ya one.