Spider gasket Lube or no Lube

[Poconos]

Just a suggestion but whatever glue you use I'd immediately reassemble the valve and put pressure on the gasket while the glue cures. If you're concerned about the glue oozing and sticking to the part that the handle lets lower onto the gasket, cut a piece of wax paper, circular with a hole in the middle. Put this over the gasket, lower the handle, then when the glue sets take the valve apart again and remove the wax paper. The glue should not stick to the wax paper. I used silicone seal in my gasket channels. As for lube, I never used any on mine. If it continues to drip the put a ball valve in the waste line. When mine leaked I did that and never had a prolem with the sight glass or anything else leaking.
Al