Microscale Micro Krystal Klear is sometimes called the modelers secret because of its versatility. Used to attach clear pieces (windows, lens...) to models it dries clear. It can be used to create small (1/4" or less) windows by using a toothpick to draw Krystal Clear around the perimeter of the opening. A final use is dripping it on wax paper to form lenses. Insider tip : Add some food coloring to create colored lenses.