Window putty is used to seal and secure glass panes within window frames. It helps prevent drafts, moisture, and dust from getting inside, making your home more comfortable and energy-efficient.

• Acts as a weatherproof barrier
• Supports the glass and keeps it stable
• Can be painted over for a finished look

Caulk and window putty serve similar purposes but have some key differences.

• Caulk is flexible, often used for sealing gaps around windows, doors, and trim. It's ideal for areas that move or shift.
• Window putty is a thicker compound, mainly used to hold glass panes in place and seal them within the frame.

The material around window glass is commonly called glazing putty. It's applied to hold the glass securely in the sash and create a weather-resistant seal. Glazing putty is easy to mold and can be painted once it dries, making it a popular choice for both repairs and new installations. You'll often see it used on traditional wood windows or when replacing broken panes.

While you can sometimes add new putty over old, it's usually best to remove any loose or damaged putty first.

• Scrape away cracked or flaking sections
• Clean the area to ensure good adhesion
• Apply fresh putty and smooth it out

Choosing the right window putty depends on your window type and project needs.

• If you have wood frames, traditional glazing putty works well.
• For metal or vinyl windows, look for a putty or sealant designed for those materials.
• Consider drying time and paintability if you plan to finish the window.