Read a little deeper Marq, it says mix with any clear coat or paint. With as thin as is recommended to apply rustoleum (or which ever brand you choose), the effect should appear with no problem. The big problem is going to be the same problem as with metallic paints: getting the flakes, or particles, to lay correctly and not completely sand it away. The question in application, at least in our roll-on case, would be whether to use the product at the first application of paint or at later stages. I think the two different choices might yield two entirely different results.

I would be really interested to see how it turns out.