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A: While some DIY solutions may be available, it's often recommended to consult a professional for IGU replacement or sealant application.
The "seal" is the adhesive barrier (usually polysulfide, silicone, or hot-melt butyl) that bonds the glass to the spacer bar around the entire perimeter.
"I have X double-pane windows with visible fogging between the panes. Frames appear intact. Please provide itemized quotes for professional defogging, IGU replacement (glass only), and full window replacement, including product specs, timelines, and warranties."