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The adhesive on mine was between the bottom of the riser and the hull shelf it supported by and, only about 3" long. Someone really made a mistake and put adhesive on the side. I am assuming it was to keep the riser in place so the screws would not loosen. Checking attachments is just part of keeping a boat that pounds in order. It's going to be a tough act to not damage the gelcoat with stripper never mind keeping the varnish off the hull during application. You might have to destroy the riser and cut it close to the shelf to make it easier to access the adhesive with a razor. Better to have to replace the riser than damage that beauty.