Resealing is a DIY-friendly task, but consider professional help if:
A fixed window has two potential seal zones:
Inspect both. Look for cracked, missing, or peeling caulk; visible gaps; condensation between glass and frame (not between panes—that indicates failed IG unit); or draft infiltration. how to reseal a window fixed
Remove old sealant and debris
Prepare the gap
Choose and load sealant
Apply sealant
Tool the bead
Finish and cure
Inspect and maintain
This is the most time-consuming step, but it is critical. Never apply new caulk over old, cracked caulk. It will not stick properly, and the draft will return in weeks. Resealing is a DIY-friendly task, but consider professional