How to Use Glazing Compound on Old Windows

Glazing compound is used to secure the glass into old window frames. A stiff, thick putty, glazing compound will prevent drafts and the glass rattling in the window frames. If you have older windows, reapplying the glazing compound every few years will prevent drafts and keep your older windows in good repair.

Step 1: Remove any old glazing compound or caulk from the wood window using a putty knife. Stubborn areas can also be removed using an utility blade. Spend as much time as you need for this step: the cleaner the frame the better the glazing compound will work.

TIP: If you are planning on painting the window frames or refinishing them in any way, now is the time to do it. Allow the paint or finish to dry for at least 48 hours before applying the new glazing compound.

Step 2: Grab a small amount of the window glazing compound and roll it in your hands, slowly warming it up. When it is pliable, roll it between your hands to create a long, narrow roll that looks like a bead of caulk.

Step 3: Press the warmed window glazing compound into the gap between the window frame and window glass. Start at a corner and work your way around the piece of glazing.

Step 4: Dip a metal edged putty knife into mineral spirits. Tap the putty knife on the side of the container, removing most of the mineral spirits, but leaving a thin film on the blade.

Step 5: Angle the putty knife so it is at a 45 degree angle from the glazing compound. Smooth the glazing compound with the knife. After every swipe, dip the putty knife in the mineral spirits before attempting to smooth another bead of the glazing compound.

Step 6: Remove any remaining glazing compound that has migrated to the surface of the glass using the putty knife dipped in mineral spirits.

Step 7: Buff away any remaining glazing compound haze with a rag dipped in mineral spirits.

Step 8. Clean the glass with glass cleaner and newspaper or paper towels to remove any leftover mineral oil.