And thanks John
Have taken to using a Stanley blade in a scraper handle; gets some of the ingrained paint off the solid seats, but sanding on solid wood is the only realistic alternative.
Now heres a thing, have begun removing paint from rear hatch deck only to find that the ply underneath is both damp and dark; and the boat has been under cover ALL WINTER, only being exposed to one night of light rain. ( So paint is easily coming away.) This supports Johns theory that the paint was hiding something; I am considering my options.
Will post picture in a moment or two