Window Putty Repair <iPhone>

For $20 and a few hours, you can extend the life of a historic window by 30 years. That’s a win for your wallet, your home’s character, and the landfill.

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.

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. window putty repair

The putty should slope from the glass down to the wood. This sheds water away from the glass. Flat or reverse slopes trap water and guarantee failure.

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. For $20 and a few hours, you can

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.

Happy glazing, and may your putty knife never slip. Repairing window putty is one of the most

For stubborn putty, tap the putty knife with a hammer lightly—like a mini chisel. Once you remove the bulk, use the hook tool to clean out the rabbet (the L-shaped groove where the glass sits).