Much of the old adhesive connecting the deck to the hull was rotting out. I previously removed the rotten stuff but there was some “good” adhesive that did not want to come out. Instead of continuing to beat myself up trying to rip it out I turned to the internet and found Marine Formula by Debond Corp. It promises to make the process of removing the old adhesive easy, and it works! Spray it on, let it sit for a few minutes, apply another coat if necessary.
Because this adhesive is old I went with three coats before I started pulling up the adhesive. It works swell. In fact in places the tension of the deck pulling away from the hull popped the adhesive off for me!
I took a quick video to show how well it works.