Don't know if this will help but I have an '89 Tracker built 20' SF and the deck is cored with balsa. The gas tank panel was cored with plywood squares however. Mine was soft under all the mounting points (screw holes) for the console and leaning post. I cut out the top skin with a 4" hole saw and was able to pick out all the soft core. I let it dry for quite a while, replaced the core and glassed back over it. Time will tell if I got it all I guess lol!
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The older I get the faster I was!
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