[color:"blue"] [/color] What is the preferred method of hull surgery?

I would guess there are three choices.

1. Jigsaw- I would guess this is undesirable as the up and down sawing would rip the fiberglass weakening it.

2. a circle cutting attachment for the drill. Never had much luck with these devices especially for a 4 to 5 inch hole.

3. Cut a hole in a piece of plywood and then clamp it down and use a router with a straight bit with a roller bearing which would ride on the circle... Or one of those guide bearings that mount on the router base...

Further to what JMHOYING says, the condensation occurs when the sun goes down, the hulls cool down, which causes the air in the hulls to cool and therefore shrink and this draws air in. The air at nights tends to have very little difference between the temperature/dewpoint, so some of the moisture condenses on the hulls which are cool. Over time this builds up. Being by the oceon/lake exacerbates this. That is one of the reasons why aircraft have fuel drains. (all fuel also has water in it.) If the aircraft sits for awhile you have to drain a bit of fuel to to get rid of the water.

Of course the other kind of condensation occurs when you go sailing without battening down the aft hatch.... wink wink, know what I mean. Although I don't know anyone who has done that.... that often. Hmmmmm seems to be riding low in the water today.....