Be careful what you're scraping with. I think the throttle body is aluminum. You should be scraping with something plastic, they make plastic razor blades. You don't want to end up scratching it too bad or else it will leak with the new gasket on.

They aren't glued on, they're just really thin almost like paper. If it hasnt been taken off before, itll stick due to the years of being squished so tightly.