I've personally used Prismatic's Super Chrome Plus, both as a "chrome" coating as well as a base coat under transparent (candy) colors. It is the best powder I've come across for trying to simulate chrome. It is shiny. With that said, it doesn't look like polished chrome plating. It more closely imitates polished aluminum. The one big drawback is that it is not UV stable, so it needs a clear coat to protect it from the sun if it will be exposed for days and days. When I tried to use it according to Prismatic's instructions, the clear coat caused it to become dull like silver paint. The solution for me was to fully bake the Super Chrome Plus, rather than "gel bake" it per instructions, and then let the part cool before applying the clear coat. Several different brand UV stable clear powders worked well for this. The Varsity test frame I coated this way turned out really nice (picture a polished aluminum Varsity).
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