Best Window Hardware (2026 Guide)
We chose items with high average ratings and substantial review volume, favoring products tailored for window and door sealing, gap-filling, and foam-cleaning tasks
The Verdict
- Best Overall: Gaps & Cracks Insulating Foam Sealant, 20 oz. Straw, Cream — Best for general gap-filling: cream insulating spray-foam designed for sealing cracks and insulating around windows and doors
- Best Premium: GREAT STUFF Multipurpose Black Gap Filler 12 oz (12 Pack) — Best for dark finishes: black multipack gap filler for visible joints where color-matching or concealment matters
This roundup covers top-rated window hardware items used for sealing, insulating, and cleaning polyurethane foam around windows and doors. Picks were selected by combining average star rating and review volume, prioritizing commonly used brands and task-specific formulations
Top Picks
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1
Best Overall Gaps & Cracks Insulating Foam Sealant, 20 oz. Straw, Cream
Best for general gap-filling: cream insulating spray-foam designed for sealing cracks and insulating around windows and doors
Ready-to-use insulating foam sealant that expands to fill gaps and cracks, creating an airtight and water-resistant seal. Customers note ease of use and quality, with some mixed feedback on color and applicator durability
- fills gaps up to 1-inch
- ready-to-use foam sealant
- creamy color options
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2
Best Premium GREAT STUFF Multipurpose Black Gap Filler 12 oz (12 Pack)
Best for dark finishes: black multipack gap filler for visible joints where color-matching or concealment matters
Black insulating gap filler that expands to seal gaps, indoor/outdoor use, and includes straw applicator for hard-to-reach spaces. Customers note ease of use and mixed views on color and applicator durability
- multipurpose black foam
- expands up to 1 inch
- straw-applied precision
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3
GREAT STUFF Foam Cleaner, 12 oz (12 Pack) for polyurethane foam residue
Best for tool maintenance: foam cleaner formulated to remove uncured polyurethane residue from guns and applicators
Foam Cleaner dissolves uncured polyurethane foam from surfaces and applicators. Includes a spray nozzle for site cleanup and helps clean dispensing guns for extended use. Customer insight notes mixed views on color and applicator durability
- foam residue dissolution
- gun cleaning capability
- multi-foam compatibility
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4
Great Stuff PRO Gaps & Cracks Foam Sealant 24 oz (12 Pack)
Best for larger jobs: professional 24 oz expanding foam offering higher yield for wide gaps and commercial-scale sealing
Expanding foam sealant fills and insulates gaps and cracks up to 3 inches, creating a water-resistant and fireblock seal around plumbing and electrical. Customer insight notes mixed opinions on color, adhesion, and applicator durability
- up to 3-inch gap filling
- water-resistant seal
- fireblock seal
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5
GREAT STUFF Window & Door Gap Filler Insulating Foam Sealant
Best for window & door seals: insulating foam tailored for narrow perimeter gaps to improve thermal and air sealing
Specially formulated minimally expanding foam that seals gaps while remaining soft and flexible after curing. Straw applicator assists in hard-to-reach spaces for precise insulation; yellow foam does not bow window or door frames
- low-pressure, flexible seal
- straw-applied for hard-to-reach areas
- air-tight and water-resistant seal