I have a GE dish washer, the bottom rack coating has come off, some of the tines, and now my dishes have rust spots on most of them. I tried to replace the rack at GE, but the part has been discontinued and the replacement rack is too big. I wonder if I can tape rusted parts with water proof tape.
There are products designed specifically for this, like this one:
I haven't tried it - I actually have a kit but never got around to it...
I definitely would not use tape because if it comes off during a wash cycle and clogs the drain you have a real mess. The racks (doesn't matter what brand) vary by model. Even when you can get replacements, the cost is a significant portion of the cost of a new dishwasher.
You could possibly use self-amalgamating tape for this, although I don't know what sort of temperatures this will stand up to.
The simplest thing may be just to clean the loose rust off the tines with gentle sanding, and cover them with several coats of nail-varnish. If there is a large area to do, use something like hammerite.