- 1). Remove old, cracked glaze putty if you're reglazing your casement windows. The glaze putty is the layer of cement-like material that lines the window in the frame. Heat a section of putty with your heat gun and use the putty knife to pry it out. Move along the window repeating this process until you've removed all the glaze putty. It might be necessary to do both sides of the window to remove all the putty.
- 2). Prime the wood of the window frame to receive the new glaze putty. Paint primer, available at home improvement shops, along the bare wood inside the window frame, using the paint brush.
- 3). Apply new glaze putty compound, available at home improvement shops. Put the can of glaze putty in a pot of warm water to make it easier to spread. Dip your putty knife into the can and spread an even layer of glaze putty over the seam where the glass of the casement window meets the wood of the window frame. Smooth the compound over, and allow several days for it to set.
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