The biggest mistake DIYers make is "caulking over" old, cracked caulk. Do not do this. You are essentially sealing a bandage over a wound that is still dirty. Use a utility knife or a caulk removal tool to scrape out the old material. It is messy, tedious work, but it is the only way the new sealant will adhere properly.
What do you have (e.g., wooden frame, PVC, aluminum)? resealing windows
Use your finger or a caulk-smoothing tool to smooth the bead. This forces the sealant into the joint and creates a finished look. 6. Let It Cure The biggest mistake DIYers make is "caulking over"
If you see condensation or a white haze between the two panes of glass, the gas seal has failed. This means the inert gas (usually argon) has escaped, and moisture has entered. Unfortunately, no amount of exterior caulk will fix this; the glass unit needs replacing. Use a utility knife or a caulk removal
Over time, the seal around your windows can crack, shrink, or pull away from the frame. This leads to drafts, higher energy bills, condensation between panes, and even water damage. Resealing your windows restores comfort and protects your home.