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post #6 of Old 10-21-2017
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Re: Large Blister on Oday 31 Rudder

As was noted by me and eherlihy, the first question is is this just a bubble in the paint, or is it in the laminate. The second thing to do is drill a hole in the bottom of the rudder to see how much water drains out. You can also tap all over the rudder to see if you have delamination. In delaminated areas you will get a dull hollow sound and may feel some give in the fiberglass skin. If you get a solid sound, then you still have a good bond between the foam and outer skin.

Until you do the above, there's not much we can do except guess wildly about what you are dealing with.

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