We used Peelaway Marine to strip the existing antifouling. It took two tubs, and we could probably have done with using a third ... It's quite expensive, but a lot cheaper than many days of scraping and sanding. Some of the first layer of AF (the black) didn't entirely come off, but scraped down fairly easily.
Under the antifouling we found a layer that we are reasonably confident (!) is a two part epoxy primer applied on top of the old coppercoat. Coppercoat reckons this is a good base.
There was still a good deal of sanding to do to prepare the surface - 80 grit, and about four days work.
If we've got all the nooks and crannies done by this weekend, the next step will be to skirt the hull and use a big diesel heater to warm it up ...
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