ok gray primer gray or gray glossy

just use duplicolor auto primer you get it at the local auto parts store same price as spray paint but works better for what your trying to do

and the other guys pretty much sum up technique

duplicolor has all kindsa products you should look at em they have a chameleon paint a glow in the dark clear coat and a professonal grade auto clear coat that you can put over you gray paint

hope this helps

I would just do a couple few light coats of auto primer gray it is flat but it is cheap and toght if you want it glossy just do clear coat over that and if you want it really fancy get rubbing compound and a good non abrasive rag and buff that puppy till it looks like a gem

you can also get buffer wheels for you dril that work just as good

then it will look like a pro did it

estimated job time buffing and all 5 - 10hrs depends how sparkly you want

I wouldn't sand the old paint off by the way if it is butted tubing the tubing is really thin I would use a chemical stripper like orange kwik or something available at hardware stores works great