Maybe I didnt answer the question you asked: SOME tricks of the trade.
Is the
bilge saturated with
oil? Has the boat been little used for a couple of years or more? (many things on a boat go bad from sitting!), any sign of
leaks at the chainplates or other
deck fittings? (this can mean wet
deck core.)
Fuel tanks in the
bilge? (often leads to holes in tanks), is the ballast encapsulated in
fiberglass or bolted on (encapsulated less likely to have problems, but bolted on can be fine), Look under all the bilge boards for
blisters in the
fiberglass inside the boat, if it has them, then will likely have them outside also. Is the
wiring neat and not been made a mess of? or is the
wiring everywhere you look messy like a birdsnest? Does the
steering seem tight and responsive? Are the
engine shifters/fuel advance smooth? Do the bilge pumps
work? You can "sound" the deck for
water saturation using a small ball peen hammer. Lightly tapping should get a clear ringing
noise response. when you get over an area that sounds dead compared with the surrounding it may be saturated. This is a bit of an art though..Oh... it just goes on and on, but remember one thing. Common sense prevails and where there appears to be a problem, there likely is one!