According to the brand I use, "Gorilla Glue", "remove cured glue from your work piece with a chisel, scraper or sandpaper." I know this is not what you wanted to hear but once this stuff is completely cured it's pretty tough. But you already know that.

At this point, I would consider sanding the thin film with some medium to fine sand paper. Try to feather out what ever you can't get completely off. Then, I know you're gonna hate this part, hit it with a little spray paint of a color that matches exactly or completely contrast the color of your coraplas. Try to get a color that's opaque so that it covers with one or two very light coats. You don't want to add any more weight to that coraplas that you absolutely have to.


With the contrast color you can tape off some flames or any type of random or symetrical pattern so that your new color scheme looks intentional.