Product review (5 stars): Save $$$ over buying a new dishwasher rack
Rerack goes on right over the rust spots on the dishwasher rack where the plastic coating has worn off.  Use it early and the rack remains strong as it was when it was new.  It also protect the dishes from rust stains.  If you wait too long to get it, you'll turn up buying the new rack and probably have rust stains on the dishes too.
Not cheap, but worth every penny.