to seal a leaking rim (because off oxidation)

Dismount the tire, clean (sand VERY lightly), remount. A very light saning to clean the mounting surface shouldn't cause any problems. Most tire places should only charge about 5 bucks each for mount/dismount

Have them mark the rim and tire so it'* mounted in the same orientation. Shouldn't have to re-balance if they do it right.

mage sure the sandpaper is a lower grain

I've had good results in the past by having the tire shop paint the rim (only the sealing surface; it doesn't show).

Yeah, if the tire doesn't come back to you with a chalk mark on the sidewall showing where the valve was, you might want to ask them if they're re-mounting it properly.

i dont know about painting them?? thats just fills it in i like the wire wheel method better

The wheel material is (very slightly) porous; the paint seals it. I'm talking only about the area of the rim that'* _inside_ the tire, as well as along its sealing surfaces. Your tire guys should know what I'm referring to...

i understand but grinding the little porosity holes away might last long than paint
will fix a flat work??

Um, no, the porosity is an attribute of the material; it goes throughout the metal. Painting a sealing coat of paint on the inner surface will block air penetration at the surface.

I... dunno. I would ask a couple of tire specialists what they think. If nothing else, keep in mind that a rotating tire is going to fling the fix-a-flat fluid _outwards_ against the inner surfaces of the tire, rather than against the rim. If you want to do some work on the inner rim surfaces, you're going to have to remove the tire.

I have to run a leaky tire over to the local place in a week or so; I'll ask around when I get there.

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