Try Permatex Super 300. It's also a brush-on liquid, and seals much better than the brown stuff. It was developed to seal aviation gasoline and other hard to handle chemicals.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!