Painting alloy and steel wheels?

[aerosam]

I have a mix of wheels on my car - this is due to using the regular sierra front hubs (13" capri steel wheels) and BMW 5 series rear end (15" multi/crosspoke alloys).

My plan is to remove the tyres, and grit blast the wheels to remove the rust and paint - then paint them all black, in the hope this will at least partially disguise the fact they don't match.

So the questions are, what paint should I be using? Can I use the same paint for the steels and the alloys? Are wheels usually painted inside the tyres? Should I mask up at all, the valve hole or bolt/stud holes?

I'll post pics up on my blog as I go, haven't worked out how to do it here yet.

Thanks guys!