Glass, unfortunately, cannot be restored, only repaired. It is just about impossible to add glass to glass. It involves matching the exact formulas used in the processing of the glass item. If a goblet encounters a large chip around the rim, Wayne would imply cut it down until abut 80% of the damage is gone. He would then roll the edges and one could not see the difference. It is possible to notice a difference in the height of the goblet as compared to it's matched stemware, but since most glass prior to 1972 was hand blown, the height of each goblet would vary anyway. The other most common repair in glassware is when an item has split in half. First, Wayne checks for additional cracks. The more chips along the break, the more damage will show. The type of adhesive used can hide up to 90% of the break. If the crack is clean, in other words, if there are no chips along the edges, the pieces can be used as before. If not, it would be best to leave it out for display purpose only. The adhesive used is an acid and bonds permanently. It is dishwasher and microwave safe.