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.
Brush away dust and debris. Lightly sand the wood frame and prime any exposed bare wood. Don’t skip this step—primer helps the new putty stick. how to fix cracked window putty
Wait at least 7–14 days before painting. This allows the putty to form a hard skin. Roll the putty into a thin rope (about
Don’t paint the putty too soon—it traps solvents and leads to future cracking. Lightly sand the wood frame and prime any exposed bare wood
Noticed cracked, crumbling, or missing putty around your windowpanes? Don’t panic—and don’t call a glazier just yet. Fixing cracked window putty (also called glazing compound) is a simple weekend project that can improve energy efficiency and prevent moisture damage.
Apply exterior paint over the cured putty, overlapping slightly onto the glass for a waterproof seal.
Here’s a quick, step-by-step guide to get it done.