I have a replacement mahogany rudder, made from 2 pieces. I'd like to leave it on for the season, salt water, in its hauled up position which leaves about 5" along the length submerged. I had lots of cracking and fouling with spar varnish and have sanded it back to bare wood. My previous rudder I had encapsulated in epoxy and it did not fare well, lots of fouling. I've heard bare mahogony does well in salt water but I'm concerned that this has a glued joint. Any suggestions?