My rudder has moisture in it and I finally decided to drill some holes in the bottom to allow it to come out as it is blistering the side and comming out anyway. I started to drill a hole and went in about a half inch. It still seemed I was drilling into fiberglass and I did not see any water leaking out. I was afraid to drill further without checking with someone else. Is it common to have that much glass on the bottom of a rudder? Should I drill deeper till I see some water or what is the deal. Tartan 30. Thanks for any help.