Window Putty Repair May 2026

The glass is cracked, the sash is rotted through, the window is second-story or higher, or you have 20+ windows to do. Professional glaziers can also remove and reset an entire pane in minutes. The Bottom Line Window putty repair is not glamorous. But finishing a window that no longer whistles on a windy night? That feels like a victory.

The good news? Repairing window putty is one of the most satisfying (and budget-friendly) DIY projects you can tackle. For the price of a few tubes of caulk, you can stop drafts, prevent rot, and save hundreds on replacement windows. window putty repair

Once your putty is fully cured (check the manufacturer’s time), prime and paint the entire sash, overlapping the putty by about 1/16” onto the glass. That tiny lip of paint locks out moisture for decades. The glass is cracked, the sash is rotted

Happy glazing, and may your putty knife never slip. But finishing a window that no longer whistles

Warm the old putty with a heat gun on low heat (or a hair dryer). Once it softens slightly, use your putty knife to scrape it out. Work parallel to the glass, not toward it.