Over time, the glazing on windows can harden and crack, and this can cause drafts and result in wind and water leaks.
If your window glass is also broken, it’s a good time to go ahead and replace the glass and reapply the putty on your single-pane window. Here is how you can do it:
- Remove the old glass carefully using a cloth over the broken glass and a hammer.
- Remove the old glazing putty with a putty knife. Use a heat gun if necessary.
- Set the new glass in place over a bead of latex caulk. Once the oozing caulk hardens, remove excess with a utility knife.
- Apply the new glazing compound, making sure you do not miss gaps and hollow spots.
- Smooth the glaze using a putty knife dipped in mineral spirits. Dip the knife and repeat as needed until all the glazed surface has been smoothed out.
- Clean off the excess glazing using a putty knife dipped in mineral spirits. Be sure not to touch the smoothed surface.
Check out the full instructions with photographs here.