Product Review

Repairing Scratched Window Glass with GlasWeld

Most scratch-removal systems use a series of increasingly fine-grit abrasives to grind and polish glass. By contrast, GlasWeld’s patented G Force™ Scratch Removal System uses a “nonabrasive” buffing process with an orbital polishing machine, polishing disks, and a proprietary compound to heat up and realign the molecules of glass—removing scratches and restoring a smooth, polished surface.

To understand how the system works, you have to understand that glass is not a crystalline solid; it is an amorphous solid. As such, the molecules are not tightly held in place. According to product manager Shiloh Spoo, the G Force system uses a combination of chemical, thermal, and mechanical actions to realign the glass molecules and remove scratches. The system relies on the specialized (nonhazardous) polishing compound, the orbital action of the polishing machine (similar to an electric drill, but faster rotating), pressure applied by the user (about 15 pounds, 70 newtons, of force), and the resultant moderate heat (135°–185°F, 57°–85°C) to realign the glass molecules, rebuilding a smooth surface. “We’ve been able to develop a system that affects the glass at a molecular level without removing the surface,” Spoo told

Published March 1, 2006