Hey there, never posted in here but ill give it a try.

On the roof of my 00 F250 SD is a small rust spot about the size of your pinky fingernail. Its the usual bubble rust form underneath. I want to know what i should do to keep it from spreading. Im talking the cheapest/fastest way to make it go away! I had a 74 F250 before i bought my SD and it had some rust on the fenderwells and god i hated that! If sombody could steer me in the right direction ide appreiciate it! Thanks