Just tried Zero 2K Diamond clear for the first time using this guide.
It just looked dull after every cost I put on, I thought, this ain't working, but then it hit that puddle stage and went like glass. Perfect reflection of my light above.
kept going a bit longer just to make sure. It's now sat under a cover for the next couple of hours and I'm going nowhere near it! I think there's a few bits of dust in it though, tackle that later.
Great tutorial, and I'm so glad I found it before trying the clear for myself.
Cheers