It had to be done, but it hurt to start. I've started on the crack in the hull. Squirting Araldite into it just after it happened worked, it is all bone dry. I used a hot air gun to soften the paint and scraped most of it off. Then went over with a power sander along all of the crack. At each end it is just a hairline crack in the surface veneer, which just needs filling. In the centre the plywood has delaminated a bit. I have opened it up with a Stanley knife so there is room to inject some slightly thickened epoxy. Then I think just a bit of fairing and sanding will finish it off. It is not in a stressed area, so I think no need for major surgery.