Product review (4 stars): Dishwasher repair goop
If you have rust spots on your dishwasher rack you can paint this on and it will hide the damage and prevent additional deterioration.  You will need to reapply periodically as it is subject to wear when dishes are inserted into the dishwasher rack.  A good temporary fix for dishwasher racks that can no longer be replaced due to unavailability of parts.