How to Recaulk Windows to Stop Drafts

Remove old caulk with a utility knife, clean the area thoroughly, and apply new weatherproof caulk in a smooth bead around the window frame.

1. Strip Away the Old Layer. Use a utility knife or caulk removal tool to cut through and scrape away all the old caulk. Work slowly to avoid scratching the window frame or glass. For stubborn caulk, apply a caulk softener and let it sit for the recommended time before scraping.
2. Bare the Frame Clean. Vacuum out loose debris from the caulk channel. Wipe down the entire area with rubbing alcohol or a degreasing cleaner to remove dirt, oils, and caulk residue. Let the surface dry completely before moving to the next step.
3. Ready Your Caulk Gun. Cut the caulk tube tip at a 45-degree angle, making the opening slightly smaller than your desired bead width. Pierce the inner seal with a long nail or the provided tool. Load the tube into your caulk gun and test the flow on cardboard.
4. Lay Down the Bead. Hold the caulk gun at a 45-degree angle and squeeze the trigger while moving steadily along the joint. Keep consistent pressure and speed to create an even bead. Work in continuous motions and overlap slightly where sections meet.
5. Smooth Like a Pro. Within 10 minutes of application, run a wet finger or caulk smoothing tool along the entire bead to create a concave profile. This pushes the caulk into the gap and creates a professional finish. Wipe your finger clean frequently on a damp cloth.
6. Let Time Do Its Work. Remove any excess caulk immediately with a damp cloth. Keep the area dry and avoid disturbing the caulk for 24 hours while it cures. Check manufacturer instructions for full cure time before exposing to moisture.