Please be joking about the JB Weld....
If, in fact, you are serious though... get all that crap off of there. JB Weld is called "Weld" for a reason. It's to form a permanent bond between two materials.
Take it apart and replace the gasket. If you don't have a new gasket or can't get one, use a sealant like ThreeBond which is designed for this purpose.