Product review (5 stars): So much cheaper than replacement racks
Second dishwasher I've used Uber Goop on. So far so good!  Caps stay on well and any areas where a cap won't work a few coats of goop does the trick. Definitely need to get rid of any loose rust and use some heavy grit sandpaper on the rusty spots. The tip of putting thumb over bottle is a must! This stuff dries quickly. It will get on your finger but can be mechanically removed with sandpaper or scraping without hurting your skin.