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Step 1. Wearing heavy leather gloves, remove the broken pieces of glass. Then, soften the old glazing compound using a heat gun or a hair dryer. Don’t hold the heat gun too long in one place because it can be hot enough to scorch the wood.

Step 2. Once a section of compound is soft, remove it using a putty knife. Work carefully to avoid gouging the wood frame. If a section is difficult to scrape clean, reheat it with the heat gun. Soft compound is always easy to remove.

Step 3. Once the wood opening is scraped clean, seal the wood with a coat of linseed oil or primer. If the wood isn’t sealed, the dry surface will draw too much moisture from the glazing compound and reduce its effectiveness.

Step 4. Apply a thin bed of glazing compound to the wood frame opening and smooth it in place with your thumb.