Once the old paint is taken off the windows with a heat gun you need painter's tape, a bucket of water, White Lightning glazing compound, metal window points, a scissors, and paper towel. The glazing compound is available at Ace and Benjamin Moore. I would stay away from the cheaper compounds, like DAP, that are available at the Home Centers. The great thing about White Lighthing is that it remains flexible, and will not crack, thus you can trim excess away, for a clean line, at antyime.
Take your painter's tape and seal off the part of the window where you don't want the glazing compound to go,and so as to achieve an even line of compound. Leave enough room between the tape and the wood for your metal point placements.
This is a photo for the metal points (you can buy them in the paint department at the Home Centers). Push them into the wood with a flat head screwdriver. Be careful not to press too hard down on the glass or you will break it. I have heard that instead of using these metal points, you can just put a narrow bead of compound in the space (below the glass and against the wood, not on the top part of the glass) here to hold the glass. I have not tried this, but it sounds like it would work. The next step is to squeeze the compound onto the top of the glass so as to hold in the window panes. Put your finger in the bucket of water and then spread the compound against the window glass and muntin to create a smooth seal. (The water facilitates the spreading of the compound and makes it easier to clean the compound off of your finger when you are finished spreading.)
I wait to peel off the tape until everything is finished--final paint coat and all. When you are finished you them simply take a razor blade and make a clean, neat cut along the frame to get a perfect finish for the glazing.
(I read later that it is good to paint the wood frame with oil based primer before beginning the glazing process because it is additional protection agains moisture.)
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