If you are in NYS then either something is really wrong with your gun or the finish is bad. You should be getting around 45 seconds for Clear Poly. I just checked GF's website and they say it is 350 - 450 centistokes which is 100 seconds #4 Ford cup, plus/minus. No clue where they get that from. But if the finish is laying on blue when you lay down too heavy a coat I doubt there is anything wrong with it. But check your new can; it's highly unlikely you got two bad cans. Actually, I've never had a bad can of finish from GF. Of course, a frozen can is something else - but that would be pretty obvious.

Now I'm wondering about the viscosity cup you have. Are you sure it's not a Zahn #4? That would make a lot more sense to use a 1.3 mm N/N for something that measures 24 seconds with it.

John