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To remove some 5200 from the floor of my boat when I pulled the seat and console up, it was recomended that I use 3M adhesive remover. Its an automotive product for taking side moldings off of cars(without damaging the paint). It worked quite well and didn't damage the gelcoat. It came in a red and white quart can.
I poured some on the aluminum plate that was stuck to the floor and allowed it to sit for about 15 min, the pulled the plate up. I was then able to rub the rest of the adhesive off with a rag.
This worked much better than the first plate I removed, when I pulled it up part of the gelcoat came off the floor with the plate:o