We just had our boat ('85 H'31) pulled for the first time in 3-4 years. Other than some rust on the bottom of the keel (that is another part of the story) there are no problems. We have owned this boat since it was new. The dealer did an epoxy barrier coating when new. Since then we have applied new bottom paint every 2-4 years (never removed the old paint). Just power wash and a light sanding to clean up any bad areas. We have never had any gelcoat blisters. The rudder is in excellent condition and the boat is generally in very good condition. The keel problem was induced by a act of nature. We moved from another slip in the marina. Normally the boat is pulled to the port side of the slip. I was working on the boat and had it centered up. As the tide was ebbing, we noticed the bow of the boat getting higher. Well it turned out that the boat was sitting on an old oil drum that was submerged in the slip. We had noticed that we had bumped something on the bottom in the past, but thought is was an old piece of wood or something. The marina owners got their backhoe with chains attached and pulled it from the mud. It turned out that the broken oil drum was rubbing on the keel and scrapped off the the barrier coat and bottom paint.