A possible addition to Destroyer’s suggestion is to make a couple of narrow, fairly long angle wood wedges, so that if the knife/scraper blade does cut the sealant, you can tap them in to separate the plate from the boat to keep the blade from binding/sticking, letting it cut more freely. Keep tapping them in and cutting. Once it’s opened up a little, you might just be able to use a knife to slice on through. Like D said, it all depends on the sealant.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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