I guess that's just about where I am. However, I found a partial way to expedite that.
As a point of detail and because I wanted something highly reflective on the rocket body to make it easier to spot, I decided to add some aluminum foil tape to the fin can area. This ties nicely (aesthetically speaking) with the spun aluminum Aero Pack boat tail. The fins are to be painted, as suggested by the earlier rendering, but I wanted the can itself to look like bare aluminum. I'm kind of going for a sounding rocket look, this part of the rocket is "unpainted". I also decided to have a bare aluminum band around the upper body, under the roll pattern. Call in the "telemetry unit" on the sounding rocket or something. Above that would be the instrument payload, below it is the motor. If it were a sounding rocket...
I bought some 2.5" wide foil tape at The Depot, which was a perfect width when spanning between 4 fins on a 3" diameter rocket. I started by wrapping a band around the diameter just ahead of the fins. Between the fins, the width of the tape allows the edges to go up the fillets about halfway, and has enough material to form around the leading and trailing edges at the root. So, the aluminum fin can conforms around the fins closely without having squared off spaces on the ends of the fins. These pieces between the fins are butted against the band ahead of the fins. Then the front band was applied. This all took some screwing around, some care, and fairly precise placement (not to mention a few choice words). As the tape was laid down, I could smooth it with my fingers and have it lay down well. I then applied 1/8" black pinstripe tape (which I happened to have) around the forward end of the fin can foil. This part of the rocket body is "vented", you see. The result:
By applying the foil tape now, it gives me a point of contact to apply masking tape, with contacting the still-soft paint from yesterday. So, I masked off the middle body, fin can, and two fins. And then I could spray the green.
Between my 2nd and 3rd coats, it started to sprinkle, so I had to relocate to the back porch. I don't think I got any overspray on the grill though... I'm afraid that there's no way around waiting for the green to thoroughly cure before masking, though. At least if I want to avoid the paint lifting that Dave pointed out. I did have that happen in a few small areas when I had to pull the foil tape up to reposition it. The adhesive on that is much more aggressive than the masking tape though...