I specialize in repairing Corian countertops. Be cautious to avoid cuts if you try this method:
Take a sharp new razor blade or utility knife blade and hold it using both hands by pinching each end with your forefingers and thumbs. Hold the sharp edge downward and the blade in a vertical position. Now, scrape gently back and forth over the superglue. Check every so often with your fingertip to feel whether any residue is left. It may take several minutes and many passes to scrape it all away.
Once the surface is smooth, you can buff the area gently with a white Scotch-Brite pad and/or a little Soft Scrub.
Jim Heaphy
TopRepair@aol.com
Jim Heaphy
November 2005