Well, this is not a great invention, but "The Thing", as I was amused to call it, has rendered me great services. I used it a hundred times for spraying and drying time of windows and exterior doors. I had the idea in my first varnishing tests. Using a water based varnish, drips appeared during application on vertical surfaces. I then thought about this principle in order to avoid the effect of gravity. I took some pieces of wood, motor, pulleys and belts, et voilà!