I have several years on my chrome powder coat with SEM 1k spray can clear, and it has held up fine. the problem i have with the 2k stuff is the film thickness. you can see it on the pictures he posted above, it looks *thick*. on a gas tank or fender that is fine. but on a rim (or worse, handlebars), it really is not a good thing. you want a thin film covering the chrome powder, and the 2k products are just too much film thickness. this really presents a problem on handlebars, as your controls (throttle mostly) just won't work unless you remove all the material. but on rims and spokes that flex, having that much clear is not a good thing either. you can't add a flex additive to spray can products, so if the clear is too thick, it can spider.
I have even used clear lacquer over chrome powder coat. that even works. you have to use something, because the chrome powder will tarnish quite quickly if you don't use a clear over it. the SEM 1k dries harder than lacquer. but depending on how you're using the bike, either will work.