Very interesting Mr. Meyer. Sounds like you may have a successful recipe going there. It's true that all lime putty plasters, Marmorino, Stucco, etc. need to be polished while they are still somewhat moist. A couple of questions though. You say this plaster sticks to a painted surface... is it an absorbent surface, i.e. with suction or do you atribute it to the acrylic content you added? And, if you don't mind me asking, what the 'pozzolon' component that you used, clay?
Good luck with your new mix.