Mike – using water based paint will most likely trap the water molecules in the resins of the epoxy and not mix well.
An oil based paint will mix better, producing more consistent results.
Wolf – the 1-step is a very durable paint, that will sand very nicely to a polished finish. I’ve had the best results with this product. One caveat – I’ve not done a lot of experimenting. Just say’n what worked for me.
I also think that Shipwrights suggestion would work as well.
Many ways to skin a cat.
-nicky