2002 Sierra/ Windshield Washer Tank

2002 GMC Sierra has developed a very small drip leak that have pinpointed at the base of windshield washer tank. Can anyone suggest a sealant ( super glue, gasket sealant etc) that i might try to use to stop the leak. Or another idea short of replacing the tank? Failing that, what problems might i encounter replacing the tank. TIA.

Think i found my answer here:
http://www.jbweld.net/products/water.php

At least worth a shot.........before plan "B"