Product review (4 stars): A lot of work if your tips are already rusty
My dishwasher is about 10 years old, so I didn't want to pay the ridiculous cost to replace the whole rack since it may only have a year or two left.  I originally tried to repaint the tips with one of the rubbery paint kits, but they looked bad again after about a year, so I thought I'd give this a try.

For the tips that weren't rusty (or barely rusty), these slipped on very easily.  For the ones that were very rusty, the tips didn't fit until I sanded the rust down on the tips.  I used a Dremel, but it took a *long* time since there were so many.  .

If I got a new washer, I'd buy these again and put them on before they all got rusty since they seem like they would be good protection, but it's a decent project to try to deal with it once the rack is in bad shape.

I'm torn on whether I should have just bought a new rack or not since the rack still doesn't look that great... but if you're reading this in the early stages of rust, I'd give it a try.  Wish I had put these on about 5 years ago.