Raf, use the 3M green tape. Just make sure all tape is pressed down well and not put on there lightly and it will work.
Just FYI, the Spraymax 2k in a can has isocyanates according to the MSDS. And it is meant to be shot over urethanes.
Some of the Rustoleum/spray can clears have been tested in a thread a while back. I'll see if I can find it.