I used it on a Back Country and it had no effect on the gelcoat. I started with a can of the aerosol adhesive remover but didn't get very far before it was gone. So, I used the toluene soaked on a rag and gradually peeled the keel guard back and pushed the soaked rag in. It will probably take 2-3 hours to do the whole thing. You may want to try a short length of rope soaked in it and push it in between the keel guard and the hull. I would not use a heat gun on cured gelcoat.
try debond it will remove any adhesive if you follow the instructions.. this stuff will loosen up 5200 which doesn't come off easily at all. FWIW I've used it to remove keel guard adhesive in the past.
The keel shields have a life time warranty- I damaged one and they replaced for free- HOWEVER- getting the old one off was one hello of a job. Finally used a steam cleaning type-pressure washer - big commercial machine- to blast the glue off.
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Will try the lacquer thinner with plastic scraper first