Reseal A Window Fixed: How To

How to Reseal a Fixed Window

Tools & materials

• Utility knife or razor blade
• Putty knife or scraper
• Painter’s tape
• Caulk gun
• Exterior-grade silicone or polyurethane window sealant (paintable if needed)
• Backer rod (for gaps >1/4")
• Rags and solvent (isopropyl alcohol or mineral spirits per sealant instructions)
• Ladder or step stool (if needed)
• Safety glasses and gloves

6. Tool & Finish

• Smooth immediately: Dip finger in soapy water (silicone) or spit (latex) and run along bead.
• Or use a caulk finishing tool for consistent concave shape.
• Remove painter’s tape while sealant is still wet.

Step 5: Tool the Bead Wet your finger with soapy water (or use a plastic spoon). Gently run it over the caulk to press it into the gap and smooth it out. Remove the painter's tape immediately before the caulk skins over.

4. Choosing the Right Sealant

| Sealant Type | Best for | Pros | Cons | |--------------|----------|------|------| | 100% Silicone | Glass-to-frame, exterior | Extremely flexible, waterproof, UV-resistant | Not paintable, difficult to remove | | Polyurethane | Frame-to-wall (masonry/wood) | Very durable, adheres to many surfaces | Requires solvent cleanup, shorter shelf life | | Acrylic Latex | Interior only | Paintable, low odor, water cleanup | Less flexible, not weatherproof | | Butyl Rubber | Older metal frames | Good adhesion to metal | Messy, shrinks over time | how to reseal a window fixed