Clean the surfaces where you’ve removed old glazing and the glass pane. The glazing will need a dust-free surface on which to adhere.
Window glazing comes in either small tubs (to be applied with a putty knife or paint scraper) or a tube (to be applied with a caulking gun). The tub of glazing works best for small areas because by using a paint scraper, you can really compress the glazing into position for a tight, compact seal.
Use a tool to scoop out a small bit of glazing to create a smooth slope along each pane of glass at roughly a 20- to 45-degree angle to the base of the window pane. Work the glazing until it is smooth.
Re-glazing windows requires a longer dry time (and extends the project timeline from a few days to a few weeks). Paint over the glazing once it has hardened.