I have a closet (mirrored) door track that has a slight bit of rust on it. Instead of replacing the entire track (which I would have to special order) I wanted to sand off the rust, prime it and paint it. What kind of top coat should I use. I hav a can of appliancepaint that says it gets very hard and is good for refinishing indoor metal products.
Basically I don't want the paint to chip and peel off when the door rolls.

 

The main thing you want to do after preparing the surface by sanding etc is prime with a primer specifically made for rusted metal such as Rustoleum's although many lines include one.No matter how well you sand you cannot remove rust to the point that there isn't at least microscopic traces left.Even that little will eventually come through unprimed topcoat though it may take time depending on conditions,moisture exposure etc.Rusty metal primers include ingredients that block and retard rust growth/regrowth.Once primed any quality top coat made be used.Oil is probably preferable and avoid lacquer or other solvent (other than mineral spirits) based top coats.Consult qualified help at a hardware or paint store to determine exactly what's best for your needs.

 

I assume the rust that shows is on the outside of the track so it is unlikely that door movement will wear it off. Sand well and use oil base primer and paint. If you can limit overpsray using a rattle can would be easiest.

 

there are some rust spots on the track as well

 

Do you mean on the inside of the track? If you sand and paint with a dark oil base paint it will be hard to notice if some wears away.