Preparing the glass
The surface of the glass must be roughened up to allow the glue to adhere to the glass. This roughening is most often done by sandblasting the area of glass to be chipped. It can also be done by grinding the glass with grit between the glass to be chipped and another hand-held piece of glass. The grit should be at least 100 grit, and coarser is better.
After this roughening is done clean the glass thoroughly. Use raised masking tape to create a dam around the edge of your glass. This will keep the glue from flowing over the sides of the glass.