: Most relatively cheap fiberglass boats are built of also cheap
: polyester resin, sitting full of water, likely for years is the
: cause of the bumps, it's call blisters but it's really osmosis.
: The fiberglass laminate is actually fairly porous, though on a
: microscopic level, it'll let water vapor pass thru it and tends
: to hold the water in the laminate and it starts breaking down.
: Easy fix is to keep it dry and leave it in the direct sun,
: though it'll take quite some time for it to dry the glass,
: perhaps months.

: Bill H.

Hi Bill and Kudzu,
many thanks for the info. Interesting about the porous nature of the laminiate. That makes sense looking at the spread of the bubbles. We dont get too many days of direct sunshine here in Ireland, but if it emerges ill pop it on the sunbed!. In meantime ill sort the insides, give it a polish and run it on the Liffey Descent on 4th Sept. http://www.liffeydescent.com/
All the best,
peter