Do you have a automotive body shop near you? I would stop in and ask them for suggestions. I know for decals they have a rubber like wheel they use to remove pin stripes and decals. They can pull the stickers off with that wheel in just a couple minutes. The right tool for the job can save you a lot of time. I don't know what else to try. Whatever you try test it first in a spot that won't be seen. That way if it screws up the paint... Well you know why. LOL:smile2:oooh::crazy::big_smile:
Possibly could use one of those single edge razor blade devices like they remove inspection stickers off auto glass with. You would have to gently bend up the two outer edges of the blade so they wouldn't dig into the gel coat as you manipulated the device. You would have to do it carefully, but I think you could pull it off in this way.
Bill in SC
Maybe using a fine sandpaper to break it down a little, then using paint thinner lightly should get most of it. I have a fiberglass boat that I have had to do some fiberglass patch work on and the paint gets down in the pours. It may put a dull finish on the area but wax the are with a little boat wax or rubbing compound and it should not be to bad an area.