Glazing Compound

Glazing compound (also called window putty or glazing putty) is a oil-based or latex-based sealant that fills the small gap between a glass pane and the wood rabbet (groove) it sits in, creating a weather-resistant seal. It is the traditional method for setting glass in wood-frame windows, particularly single-pane windows in older homes.

Types of Glazing Compound

• Oil-based glazing putty — traditional linseed oil putty; slow to cure (4–14 days before painting); excellent durability when properly maintained; used for historic preservation
• Latex glazing compound — faster drying (24–48 hours); easier cleanup; more flexible; recommended for most DIY repairs
• Siliconized acrylic — very flexible and weather-resistant; adheres well to both glass and wood; good choice for high-movement situations

When Glazing Compound Needs Replacement

Over time, glazing compound dries out, shrinks, and cracks, losing its seal. Signs of failed glazing include:

• Visible cracks or gaps in the triangular bead of compound at the glass edge
• Compound pulling away from glass or wood
• Crumbling or chalky compound
• Water infiltration at window glass edge

Re-Glazing Process

Re-glazing a wood window is a traditional skill. Remove all old putty (heat gun or putty knife), clean the rabbet, apply fresh putty triangularly at 45°, smooth with a glazing tool or wet finger, let cure, then prime and paint to seal. Cost for professional re-glazing: $50–$150 per window.