Window Putty Repair !!install!! May 2026

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.

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.

Check the wood for rot. If it feels spongy or crumbles, you’ll need a wood hardener or epoxy filler before proceeding. A soft frame will just crack your new putty later. Take a golf-ball-sized lump of glazing compound and roll it between your palms into a "sausage" (about ½ inch thick). window putty repair

Happy glazing, and may your putty knife never slip.

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. Warm the old putty with a heat gun

—it will shrink, crack, and ooze out. Patience pays off. When to Call a Pro (And When to DIY) DIY if: You have basic hand tools, one afternoon, and the wood frame is solid.

Press this sausage firmly into the L-shaped corner where the glass meets the wood. Run your thumb or a putty knife along it at a 45-degree angle to create a smooth, beveled slope. For $20 and a few hours, you can

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).