Cementing: How to weatherproof and strengthen leade glass panels

Using a natural bristle scrub brush, push the cement under the leaf of the came by brushing at a right angle to the cames in the interior of the window. As you approach the lead or zinc on the borders, decrease the angle of the brushing to keep from distorting them. After cementing, push the border came back against the glass. SPECIAL NOTE: A scrub brush with plastic bristles will react to the solvents in your glazing compound causing the bristles to soften, fall out, or even melt. Another good choice is to take a 3" natural hair paint brush and cut the bristles off very short (less than one inch).
After you are sure the cement is in all the cames, pick up the excess cement on the panel by scrubbing parallel to the cames, then scraping the excess back into the tub.
Spread whiting (calcium carbonate, also referred to as chalk) over the panel with your hands while wearing rubber gloves. This keeps the cement from oozing, and allows the cement to begin setting up. You now need to turn the panel over to complete the same process on the other side.

A window should never be put into a horizontal position unless it is supported. To turn a panel over:

Slide the panel toward you until it rests half on and half off the table. The edge of the table should run through the middle of the panel.	With a sweeping motion, bring the panel from the horizontal position to vertical while keeping the middle of the panel supported by the edge of the table.	Turn the panel around while holding it from the top. (It is a good practice to handle all windows and sheets of glass in this manner.)	Put it back on the table by reversing the procedure describe in steps one and two.
Sweep any excess whiting away from around the panel before proceeding. If the panel has been properly cemented, you will notice some cement has come through the cames from the other side. This is important because in order for the panel to be strong and weatherproof, the cement needs to be next to the heart of the came as well as under the leaf. Repeat steps 2 through 4 on the second side.

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