Painting Tillotsons

[Brian T]

I know some of you will question why, but I will ask anyway, I would like to paint my Tillotson carbs black, I am thinking I will use Rustoleum appliance paint which I believe is an epoxy type paint?.
As they have a smooth surface I need to key the surface for the paint to adhere, they are to complex of a shape to sand on and I did not what to fine media blast them, is there an acid such as Ospho that would etch them enough for this purpose.
I have read that there is no absolute fuel proof paint, the good model airplane paint that did work is outlawed in Cali and maybe else were, also I understand that curing enamel paint is a must and can take a few weeks (not a problem in this case) --- any suggestions appreciated.
Thanks Brian.