CNKS,
No problem with rust paints sticking to metal or stuff like picklex. The trouble comes when you topcoat it. The por 15 rust paint doesn't accept top coats well. (peeling/chips) There is a special primer called tie bond that is suppose to seal it off. You have to prep metal for it like your removing rust and use a metal conditioner called Marine clean. You may as well continue and remove all the rust. Very expensive with the paint, primer, and marine clean for paint that is UV sensitive and fades quickly left on it's own. Rod has used Extend brand successfully.Nathan,
Your right about removing rust to eliminate it. Rattle can paint won't prevent rust returning. The only primer that will prevent rust on its own is 2 part epoxy. It is water proof. The other paints are poreous and allow moisture to reach the metal. Overtime surface rust slowly occurs. This is basically how a painted surface gets surface rust--from below the paint where it slowly develops. Then when topcoats are decayed by the elements the process speeds up. Since Earl has already said he can't paint it now correctly, My suggestion is a canvas tarp to cover it when not in use, if he can't shed it. The tarp would at least stop UV rays from futher decay of the top coat and protect it from rain and night time moisture. Thus slowing the rusting until he can take care of it. Canvas doesn't breath well so machinery should be checked for moisture under canvas in humid weather. Like the water that forms on the outside of an icy drink. Not perfect but a way to slow the process, also good for the starter and Gen or alternator protecting them from rain water. To me it depends on whether he will strip the paint, or be willing to, should he decide Extend or a rust converter over the rust now with a rattle can top coat is what he wants to do. I agree rattle can over the whole tractor will not look very good and would eventually need stripping.
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