What Is Window: Putty Made Of

In modern times, synthetic alternatives to traditional window putty have been developed, including:

If you live in an older home or are restoring traditional wooden sash windows, you’ve probably heard of (also called glazing putty). But what exactly is this squishy, clay-like substance that holds glass in place? what is window putty made of

Traditional linseed oil putty contains exactly things: The oil soaks into the grain of the

Linseed oil putty "feeds" the wood. The oil soaks into the grain of the window sash, helping to preserve the wood and prevent rot. This can take a few weeks or even

Fresh putty is soft and workable. But once applied to a window and exposed to air, the linseed oil — it absorbs oxygen and slowly polymerizes into a tough, rubbery solid. This can take a few weeks or even months, which is why old-timers often painted over putty to protect it while it cured.

If you are buying putty for a DIY project, look at the label. The best quality glazing compounds will list as the primary binder. Avoid products that rely heavily on "petroleum distillates," as these tend to dry out and crack much faster than plant-based oil versions.