Morning all - yes Fender3x and Trevor - I think you hit the nail on the head. I did a light sand to take the "dust" off and re-sprayed a fair bit closer. It is much smoother and feels "right". Good call. I'll give it a light 400 sand, and another coat of primer at the better distance. Thanks.
I've attached a couple of pics of a hammered copper paint I used for a turntable pre-amp I made. It's quite a nice effect.