One pull along the edge of the glass will burnish both sides at one time.
This durable plastic crimper makes the burnishing task a breeze.

After foiling the piece of glass, slightly push down the foil on all sides and ‘crunch’ the corners. Then slide the piece of foiled glass through the Kwik-Crimp fingers. With one swipe, the foil is strongly adhered to the sides of the glass and the foil is ready for soldering.
Can’t believe it can be this fast and effortless! Go to your nearest stained glass store for a demonstration. Foiling could never be this kwik.