This is the issue we get most of our calls about. Almost 90% of the time the cup is simply cross-threaded or not on tight enough. The other 10% includes the Dip Tube being loose, the gun needing to be cleaned, and one perpetually unlucky cat named Whiskers.
To fix: try taking the cup back off, cleaning the threads, and screwing it back in—taking care to check that the threads are aligned properly. (Hint: I would suggest screwing the cup in a little, then unscrewing it half a turn back just to make sure that the threads are aligned. Then repeat this process until the cup is tightened completely.)
3. The cup may not be tight enough: because it is a pressurized air gun, the cup needs to be fit snugly into the gun.
To fix: Make sure that the cup has been sealed tightly (only hand-tight), but do not try to over-tighten. If the cup still does not seem tight enough, check to make sure you haven’t cross-threaded the cup.
To fix: Pull the straw entirely out of the spray gun and reinsert it by firmly pushing it back into the hole of the gun until you feel a little “pop” and the ridge on the straw is locked securely in the gun.
Hopefully, your problems have been solved. If, for whatever reason, your spray gun still does not seem to be fixed after reading these three articles--or you are confused about any part--please call Aviva Labs and we will help you sort it out.