To some, a painted bottom does devalue as it typically means the boat has been in the salt. If it hasn't it still can lead to a bit of devalue because it becomes a maintenance project to keep it looking good if one cares. I have found over the years waxing the bottom of the hull helps a bit when removing the scum on the boat but its pretty neglible impact. For boats that heavily marred by the rusty color that can be gotten off with with bartenders friend and a little elbow grease.
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