You need it let it dry for 24+ hours.....
What if there are imperfections in the glass?
This thread is filled with the usual "this guy is wrong and I am right" nonesense that clutters RC as of late.
I doubt that you are too inept to "properly install" a bulkhead as, honestly, my four year old niece could probably manage it (well, maybe not tight enough, but you get what I mean - installing a bulkhead is NOT a hard concept).
What is a "better" gasket? The gaskets supplied with the bulkheads are perfectly suitable for the purpose at hand. If and when it is determined that the gasket is at fault, then spending the time and money to purchase a new one would be a reasonable endeavor. However, from the context of this thread, there is no reason to beleive that the gasket is bad. Instead it would appear that the bulkhead is not properly installed.I would just grab a better gasket and give it a try.
I would replace the bulkhead.
If the bulkhead is already Glued to PVC, buy a heatgun from Home Depot and heat the threads of the bulkhead. The trick will be keeping the glass cool.
I've replaced many PVC items with heating the PVC. I have also used a heatgun to give me a little more angle on a 45* pvc so there was zero pressure on the return bulkhead.
Holy crap! "What could possibly go wrong?"
True Union Ball Valve just after the bulkhead. Always always always!!!
It may work for you but I would not recommend to others using high heat tools.like heat guns or blown torches etc on reef tank plumbing and near glass. Even with the caveats.
Using TU ball valves is a much safer and more straightforward way to allow easy removal of plumbing sections including bulkheads.