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Read the story from Matt Bounds about the leaking mast on his H17 at the H17 Nationals in San Francisco a couple of years ago...
How much time did you spend 'swimming' this past season? Any turtles? Any reason to suspect the joint between the comp tip and the mast? The mast plug? Or a problem with the seal at the top casting?
Probably, you can drain the mast from the bolt hole area at the mast rotator....however, be careful not to remove the entire bolt as the compression sleeve can slip out...
Then re-silicon all the holes where the mast has been riveted or bolted.
I don't bother, as we sail with a Hobie Bob....
1989 Hobie SX18 Sail # 1947 "In Theory..."
'Only two things are infinite, the universe, and human stupidity. But I'm not sure about the former.'