Something else I just thought of. Talk to your painter first, but sometimes you can wet sand it with 1500 or finer paper which will allow the paint to "open Up". In other words sometimes it will get a slightly hard "shell" that keeps the solvents underneath from escaping, therefore slowing the cure. It has many coats of clear and when you do that this can happen. If you do this AND get it someplace warm and dry ( try shipping it to Italy so it can get that well deserved Mediterranean holiday), it should cure after a few days. All that's left if to buff it. But, talk to your painter first!