How To Fix Cracked Window Putty Exclusive Link

Gently work a putty knife or small chisel under the cracked sections. Remove only the loose or damaged putty, leaving firm areas if they’re still bonded well.

Apply exterior paint over the cured putty, overlapping slightly onto the glass for a waterproof seal. how to fix cracked window putty

Wait at least 7–14 days before painting. This allows the putty to form a hard skin. Gently work a putty knife or small chisel

Use a heat gun on low (or a hair dryer) to warm the cracked putty. Don’t overheat—just enough to soften it. Wait at least 7–14 days before painting

Roll the putty into a thin rope (about ¼–⅜ inch thick) and press it firmly into the gap between the glass and frame. Smooth it with a putty knife at a 45° angle, matching the profile of the old putty.

Here’s a quick, step-by-step guide to get it done.

Don’t paint the putty too soon—it traps solvents and leads to future cracking.