Odds are, you are good to go right now. As previously stated, the “sniff test†is a good way to check for cured paint. As it dries, it “gasses outâ€; thus the reason you can still smell it.
Tamiya (again as previously stated) is good. Regular old Magic Tape can be used, as long as there are no compound curves to wrap around. It has to stick, and still be stuck 5+ minutes later.
I will use BMF right at the edge of the color separation, and use whatever to cover the rest… masking tape, tin foil, etc. Just be sure to apply the BMF last. That way, when you remove the foil, tape, and what not, it will lift up the BMF with it.