David has completed his assessment for the damage to Wanda, and has provided an outline on how the GRP repairs should be approached. Finally I can start work now that I have some expert advice to guide me through the process.
First up I need to have the entire hull grit-blasted. Grit blasting will remove all the years of antifouling, but more importantly it will expose any filler that has been used. We suspect that Wanda has previously been beached; the presence and location of filler will support that suspicion. Grit-blasting will also shake out any loose filling. At that stage we can decide whether or not to replace the filler by feathering back and laying up glass – this depends on whether we are dealing with a few scratches or deep gouges. Laying up with chopped strand map and resin, then fairing back is far more labour intensive; but overall a better solution than using filler.
Deck to hull join
There is a metre long crack along the port side toe rail. This is in the vicinity where the impact was more severe. In order to restore this we will first need to grind back and feather out around the split. This will allow enough area to lay chopped strand mat and build up the toe rail. Before this can be finished however, the deck to hull join needs to be secured.
The recommendation for this repair is as follows:
- gently tap in wedges to lift the deck from the hull joint
- clamp the toe rail to re-align flush to the hull
- Fill the cavity between the deck and hull joint with epoxy
- Secure with self tapping screws.
Once this is completed the toe rail split can be layed up and glassed in.
Once the external GRP repairs have been completed I can re-set the frames that have been damaged. First I will need to cut away the loose tabbing. Then I can grind back either side of the frame to prepare for re-fixing the frames to the shell. The frames themselves can be cut away. Then I need to form new frame moulds using foam; these forms will then have layers of matting built up to create the frames which are bonded back to the shell.
The aft shroud webbing also need to be cut away and removed entirely. I will need to be careful to keep the shape intact so I can fabricate a new one out of marine ply. This will then be laid up with fibreglass and bonded back into the shell.
More details can be seen here:
Completing the grit-blasting will be the next stage in the process for the external work. For the internal work, I will need to prepare the cabin before I start any grinding. This means covering as much of the interior in plastic sheeting and setting up extraction, to control the spread of GRP particles. From my understanding grinding back the shell can be nasty and messy work.
I was just following up on the news regarding Hurricane Irma and came across this footage. This is the boatyard in Sint Maarten where Wanda had been laid up the past few years. I wonder if this might have been her fate in a previous life..