I have what I THINK IS A Ford #4 cup; water runs through it in 10 seconds. I am going to be applying General Finishes High Performance Polyurethane Water Based Top Coat. When I run it through my Ford#4 it takes around 70 to 80 seconds which seems way to thick to spray. Does 70 to 80 seconds even seem possible? Perhaps I did something wrong? Using a Apollo 1050VR with a 7500 gun to apply finish. Can this be thinned with water?