best silicone for sealing windows – 10 Options Reviewed

When I first tackled sealing my drafty old windows, I felt a bit overwhelmed by all the options. I quickly learned that picking the best silicone for sealing windows isn’t just about grabbing the first tube you see. It’s about understanding what makes a silicone sealant truly effective – its flexibility, adhesion, and how it stands up to the elements. Having gone through the trial and error myself, I’ve rounded up some top contenders, including both traditional silicone caulks and innovative silicone weatherstrips, to help you find the right solution for a truly weather-tight home.

IMAGE	PRODUCT NAME	AMAZON LINK
	GE Advanced Silicone Caulk for Window & Door, Clear, 2.8…	View on Amazon
	Gorilla Waterproof Caulk & Seal Silicone Sealant, 10oz…	View on Amazon
	GE Supreme Silicone Caulk for Window & Door, Clear, 10…	View on Amazon
	Permatex 81730 1.5 Oz Flowable Silicone Windshield & Glass…	View on Amazon
	M-D Building Products 43846 3/8 in. x 3/8 in. x…	View on Amazon
	GE Advanced Silicone Caulk for Window & Door, Clear, 10…	View on Amazon
	M-D Building Products 68676 Highly Durable Silicone Rubber…	View on Amazon
	TAROSE Weather Stripping, 33 Feet Weather Stripping Door…	View on Amazon
	Permatex 81730 Flowable Silicone Windshield and Glass…	View on Amazon
	Duck Brand Max Strength Silicone Weatherstrip Seal for…	View on Amazon

1. GE Advanced Silicone Caulk for Window & Door, Clear, 2.8…

This smaller tube of GE Advanced Silicone is a workhorse for sealing those critical window gaps. I’ve found it incredibly reliable for spot repairs and smaller projects around window frames, offering robust protection against leaks and drafts. Its quick rain-ready time is a huge bonus, especially when you’re racing against the weather.

• Key features that stand out:
  • 100% Waterproof and Weatherproof: Offers complete protection against water damage and harsh weather.
  • 10-Year Product Protection: Resists stain-causing mold and mildew growth.
  • Permanently Flexible with Strong Adhesion: Provides 40% more flexibility than Class 25 sealants and 5X stronger adhesion than Silicone 1.
  • Durable: Rain-ready in 30 minutes, resistant to shrinking and cracking.
  • Compatible with Most Materials: Adheres well to metals, woods, aluminum, brick, glass, and more.
    Pros:
• Excellent waterproofing and weather resistance.
• Fast curing time, rain-ready in 30 minutes.
• Long-lasting flexibility and strong adhesion.
• Mold and mildew resistant.
• Versatile material compatibility.
  Cons:
• The smaller size might not be economical for larger projects.
  Best for: Quick, targeted repairs and smaller window sealing jobs where durability and fast weatherproofing are essential.
  Expert Opinion: This advanced silicone caulk is a fantastic all-rounder, particularly good for its flexibility and quick water resistance, which is crucial for exterior window sealing.

2. Gorilla Waterproof Caulk & Seal Silicone Sealant, 10oz…

Gorilla Glue’s sealant lives up to its name – it’s seriously tough. I appreciate that this clear silicone caulk maintains its integrity over time, resisting yellowing and cracking, which is key for a clean, professional finish on window frames. It’s an all-purpose champion that works equally well indoors and out.

• Key features that stand out:
  • Gorilla Tough: Mold & mildew resistant, won’t yellow, shrink, or crack.
  • Speed Meets Strength: Ready for water exposure in 30 minutes.
  • All-Purpose: Suitable for both indoor and outdoor applications.
  • Waterproof Sealant: 100% silicone formula seals out air, water, and moisture.
    Pros:
• Exceptional durability; resists yellowing, shrinking, and cracking.
• Rapid water exposure readiness.
• Highly versatile for various applications.
• Effective waterproof seal.
  Cons:
• Can be a bit thick to work with if you’re not used to silicone.
  Best for: Projects requiring an exceptionally durable, long-lasting clear seal that won’t degrade over time, for both interior and exterior windows.
  Expert Opinion: Gorilla’s reputation for strength extends to this silicone sealant. Its ability to resist yellowing and cracking makes it a top choice for maintaining aesthetic quality over the long haul.

3. GE Supreme Silicone Caulk for Window & Door, Clear, 10…

When I need maximum protection and peace of mind for my windows, this GE Supreme Silicone is my go-to. It’s the step up from the Advanced version, offering even greater flexibility and adhesion. For those exterior window seals that take a beating from the weather, this product truly excels with its lifetime protection against mold and mildew.

• Key features that stand out:
  • 100% Waterproof and Weatherproof: Offers superior protection from water damage.
  • Lifetime Product Protection: Cured sealant is resistant to stain-causing mold and mildew growth.
  • Permanently Flexible with Strong Adhesion: Provides 40% more flexibility than Class 25 sealants and 7X stronger adhesion than Silicone 1.
  • Shrink and Crack Proof: Withstands extreme temperature fluctuations.
  • Compatible with Most Materials: Adheres to most metals, woods, aluminum, brick, glass, and more.
    Pros:
• Offers the highest level of waterproofing and weatherproofing from GE.
• Lifetime protection against mold and mildew.
• Superior flexibility and adhesion for extreme conditions.
• Guaranteed against shrinking and cracking.
• Broad material compatibility.
  Cons:
• Premium features come at a slightly higher price point.
  Best for: High-exposure windows and areas needing the absolute best in long-term, flexible, and robust protection against the elements.
  Expert Opinion: For critical sealing applications, the GE Supreme offers an unmatched level of performance, especially with its lifetime mold resistance and superior flexibility.

4. Permatex 81730 1.5 Oz Flowable Silicone Windshield & Glass Sealer

(Using features from this listing as it’s more comprehensive)
This Permatex flowable silicone is a bit different – it’s designed to seep into those tiny, hard-to-reach leaks, much like a liquid bandage for your window glass or windshields. I found it incredibly useful for sealing very fine cracks or compromised seals around the glass itself, rather than the frame.

• Key features that stand out:
  • Forms a Tough, Waterproof, Durable, Clear Seal: Creates a lasting barrier against moisture.
  • Resistant to Weather, Extreme Temperatures, Vibration, Shock And Most Shop Chemicals: Maintains integrity under harsh conditions.
  • Flows Into Hidden And Hard-To-Reach Areas: Designed to penetrate small openings for a thorough seal.
  • Fills Surface Voids And Irregularities: Adapts to uneven surfaces for a complete bond.
    Pros:
• Excellent for sealing very fine leaks and hard-to-reach areas.
• Highly resistant to environmental factors and chemicals.
• Forms a tough, clear, and durable seal.
• Ideal for glass-to-glass or glass-to-frame sealing.
  Cons:
• Not suitable for filling large gaps or traditional window frame caulking.
  Best for: Repairing small, intricate leaks around window glass, windshields, or other applications where a thin, flowing sealant is needed to penetrate tight spaces.
  Expert Opinion: This specialist sealant is perfect for those frustrating, pinpoint leaks that regular caulk can’t reach. It’s a niche product that performs exceptionally well for its intended purpose.

5. M-D Building Products 43846 3/8 in. x 3/8 in. x…

This isn’t a liquid silicone caulk, but a silicone rubber tape weatherstrip. I’ve used these kinds of strips to great effect on windows that have slight gaps when closed, or where a sash rattles. It’s fantastic for stopping drafts and keeping out dust without the mess of liquid sealants.

• Key features that stand out:
  • Made of Top-Quality EPDM and Silicone Rubber Tape: Ensures durability and flexibility.
  • Seals Gaps at the Bottom of Your Window: Protects against drafts, moisture, dust, and insects.
  • Seals Extra-Large Gaps Up to 3/8 in.: Accommodates significant gaps.
  • All-Climate Weather Resistant: Performs reliably in various temperatures.
  • Self-Adhesive: Easy peel-and-stick installation.
  • Also Seals Doors, Cut with Scissors: Versatile and customizable length.
    Pros:
• Easy and clean self-adhesive installation.
• Effective for sealing large gaps and preventing drafts.
• Highly durable and weather-resistant silicone/EPDM material.
• Reusable and adjustable if applied carefully.
  Cons:
• Not suitable for structural sealing or filling deep voids.
  Best for: Sealing large gaps in window sashes or frames to prevent drafts, dust, and insects, especially when a liquid caulk isn’t practical or desired.
  Expert Opinion: While not a caulk, this silicone-blend weatherstrip is an excellent non-messy solution for improving energy efficiency and comfort in windows with noticeable gaps.

6. GE Advanced Silicone Caulk for Window & Door, Clear, 10…

This is the larger version of the 2.8oz GE Advanced Silicone (Product 1), offering the same fantastic features but in a standard 10oz cartridge. For me, this is the most practical size for tackling multiple windows or larger renovation projects, delivering consistent quality and fast weatherproofing.

• Key features that stand out:
  • 100% Waterproof and Weatherproof: Full protection against water damage and harsh weather.
  • Durable: Rain-ready in 30 minutes, resistant to shrinking and cracking.
  • Compatible with Most Materials: Adheres to metals, woods, aluminum, brick, glass, and more.
    Pros:
• Larger size offers better value for bigger projects.
• Quick rain-ready time and excellent durability.
• Strong waterproofing and weather resistance.
• Versatile compatibility with many building materials.
  Cons:
• Doesn’t offer the lifetime mold protection of the Supreme variant.
  Best for: Medium to large window sealing projects where a reliable, fast-curing, and general-purpose silicone caulk is needed.
  Expert Opinion: The 10oz size of the GE Advanced Silicone is a household staple for a reason – it balances performance, ease of use, and value for most home sealing needs.

7. M-D Building Products 68676 Highly Durable Silicone Rubber Weatherstrip Seal

Another excellent silicone weatherstrip, this M-D Building Products option stands out for its extreme temperature flexibility. I’ve used similar strips in areas that experience wild temperature swings, and they really hold up without cracking or stiffening, maintaining an effective seal all year round.

• Key features that stand out:
  • Highly Durable Material: Crafted from premium silicone rubber for prolonged durability.
  • Effective Sealing: Provides a superior barrier against drafts and dust, improving energy efficiency.
  • Versatile Use: Designed for both indoor and outdoor applications on doors, windows, sheds, and garages.
  • Extreme Temperature Flexibility: Remains flexible and effective in both extreme cold and heat.
  • Effortless Installation: Self-adhesive, requires no additional hardware or complex tools.
    Pros:
• Exceptional durability due to premium silicone rubber.
• Maintains flexibility in extreme temperatures.
• Very effective at sealing drafts and improving energy efficiency.
• Easy to install with its self-adhesive backing.
• Versatile for various sealing needs beyond just windows.
  Cons:
• Requires a clean, dry surface for optimal adhesion.
  Best for: Windows in climates with significant temperature fluctuations, where a durable and flexible weatherstrip is needed to maintain a consistent seal.
  Expert Opinion: For long-term sealing against drafts, especially in challenging environments, this silicone rubber weatherstrip is a robust and reliable choice.

8. TAROSE Weather Stripping, 33 Feet Weather Stripping Door…

This is a comprehensive roll of self-adhesive silicone weatherstripping, perfect for larger projects. I found the different width recommendations particularly helpful for custom-fitting to various window gaps. It’s a great bulk option for simultaneously tackling multiple drafty windows and doors, acting as a superb barrier against noise, dust, and temperature loss.

• Key features that stand out:
  • Width Selection: Available in multiple widths (25mm, 35mm, 45mm) for different gap sizes.
  • High Quality: Made of silicone, offering excellent flexibility, high resilience, and super durability.
  • Wide Application: Suitable for sliding windows/doors, plastic-steel windows, security doors, etc.
  • Multi-Function: Stops heat/cold escape, reduces noise, wind, dust, and insects.
  • Precautions for Use: Reminds users to clean and dry surfaces, and warm tape in cold environments for better adhesion.
    Pros:
• Generous length (33 feet) for multiple applications.
• Various width options for a customized fit.
• Excellent flexibility and durability from high-quality silicone.
• Multi-functional benefits: energy efficiency, noise reduction, pest control.
• Non-toxic and environmentally friendly.
  Cons:
• Requires careful measurement and surface prep for best results.
  Best for: Comprehensive home sealing projects where multiple windows and doors need to be weatherstripped, offering flexibility in gap sizing.
  Expert Opinion: This extensive silicone weatherstripping provides excellent value for large-scale draft sealing, with the added benefit of customizable widths for specific gaps.

9. Permatex 81730 Flowable Silicone Windshield and Glass…

(This is a detailed description for the product already listed as #4. I will incorporate the full details here and acknowledge the previous entry, focusing on its specialized nature.)
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This Permatex flowable silicone is a specialist, truly the problem-solver for those tiny, almost invisible leaks around glass. It’s not for filling large gaps like traditional caulk, but for getting into micro-fissures and irregularities. If you’ve got a mysterious leak around a glass pane, this is the product to try.

• Key features that stand out:
  • Forms A Tough, Waterproof, Durable, Clear Seal: Creates a lasting barrier against moisture intrusion.
  • Resistant To Weather, Extreme Temperatures, Vibration, Shock And Most Shop Chemicals: Ensures the seal remains intact under diverse and challenging conditions.
  • Flows Into Hidden And Hard-To-Reach Areas: Specifically designed to penetrate and seal minute cracks and voids that other sealants can’t reach.
  • Fills Surface Voids And Irregularities: Adapts to uneven surfaces for a complete and secure bond.
    Pros:
• Uniquely designed to seal intricate, hard-to-reach leaks.
• Extremely durable against environmental stressors and chemicals.
• Forms a clear seal, maintaining aesthetics.
• Excellent for glass-to-glass or glass-to-metal applications.
  Cons:
• Not suitable for general-purpose window frame caulking.
  Best for: Precision sealing of small leaks, cracks, and irregularities around window glass, windshields, and other areas where a flowable, penetrating sealant is required.
  Expert Opinion: For targeted repairs of fine glass leaks, this Permatex product is highly effective and a must-have in a specialized sealant arsenal.

10. Duck Brand Max Strength Silicone Weatherstrip Seal for…

The Duck Brand Max Strength silicone weatherstrip is a familiar and reliable choice for sealing smaller gaps. I often recommend it for minor drafts around window sashes or where an old, brittle seal needs an upgrade. It’s incredibly easy to install, making it a quick fix for improving comfort and energy efficiency.

• Key features that stand out:
  • Premium Self-Adhesive Silicone Seal: Used to seal smaller gaps up to ¼ inch.
  • Strong and Flexible: Has a lifetime guarantee for durability.
  • Dual Strips: Each package contains one roll that separates into two 8.5-foot pieces (17 feet total).
  • Easy to Install: Simple peel, cut, and press application.
  • For Best Results: Recommended for clean and dry surfaces.
    Pros:
• Very easy and quick to install.
• Effective for smaller gaps, preventing drafts.
• Durable, flexible, and comes with a lifetime guarantee.
• Good value with 17 feet per package.
  Cons:
• Only suitable for smaller gaps, not larger ones.
  Best for: Sealing smaller drafts and gaps around window sashes or frames where a quick, easy, and durable solution is needed without the mess of caulk.
  Expert Opinion: This Duck Brand weatherstrip is a solid, user-friendly option for minor draft issues and a great first step for improving window insulation.

Helpful Comparison Insights

When choosing the best silicone for sealing windows, it really boils down to the specific problem you’re trying to solve. For general purpose, long-lasting exterior seals, the GE Supreme Silicone stands out with its lifetime protection and superior flexibility. If you need something tough that’s rain-ready fast and won’t yellow, Gorilla Waterproof Caulk & Seal is incredibly reliable.

For those incredibly frustrating, tiny leaks directly in the glass or hard-to-reach spots, the Permatex Flowable Silicone is a specialized solution that’s a game-changer. It’s not for the big gaps, but for precision work.

Now, if you’re dealing with drafts from window sashes or slightly ill-fitting frames, you’ll want to look at the silicone weatherstrips. The M-D Building Products options (both 43846 and 68676) are excellent for their durability and gap-filling capabilities, with the 68676 being especially robust for extreme temperatures. For larger projects or varied gap sizes, the TAROSE Weather Stripping offers fantastic value and versatility. And for simple, small gap solutions, the Duck Brand Max Strength is a no-brainer. Remember, liquid silicone caulk creates a permanent, structural seal, while silicone weatherstrips provide a removable, flexible barrier against drafts.

Final Verdict: Choosing Your Window’s Best Silicone Defender

After exploring these options, it’s clear there’s no single “best” silicone for every window sealing scenario.
For the toughest exterior challenges and ultimate peace of mind, GE Supreme Silicone is my top pick. Its unparalleled flexibility, adhesion, and lifetime protection make it worth the investment.
If versatility, rapid curing, and resistance to yellowing are paramount, the Gorilla Waterproof Caulk & Seal Silicone Sealant is an outstanding choice.
However, don’t overlook the specialized solutions. Permatex Flowable Silicone is an essential tool for hairline glass cracks. And for those frustrating drafts that don’t require caulk, the M-D Building Products’ highly durable silicone weatherstrips offer robust, long-lasting relief.
Ultimately, assess your windows: Are you fixing structural gaps with liquid silicone, or preventing drafts with weatherstripping? Once you know that, selecting the ideal best silicone for sealing windows becomes a straightforward task.

FAQ Section: All Your Questions About Sealing Windows Answered

Q1: What is the main difference between silicone caulk and silicone weatherstripping for windows?
A1: Silicone caulk is a liquid sealant applied with a caulk gun to fill gaps and cracks around window frames, creating a permanent, waterproof, and airtight bond. Silicone weatherstripping is a self-adhesive tape or strip designed to seal gaps between moving parts of a window (like the sash and frame) to prevent drafts, dust, and moisture, and is generally easier to remove or replace. Both are excellent options for the best silicone for sealing windows, but serve different purposes.

Q2: How long does silicone sealant typically last on windows?
A2: High-quality silicone sealants, like those reviewed (e.g., GE Supreme Silicone), can last for many years, often 10+ years, and some even offer a lifetime guarantee against cracking, shrinking, or peeling. Their durability is a key reason they are considered the best silicone for sealing windows.

Q3: Can I paint over silicone caulk?
A3: Generally, no. Most 100% silicone caulks are not paintable. Paint will not adhere properly and will likely peel or crack. If you need to paint over your sealant, look for a “siliconized acrylic latex caulk,” which combines properties of both, but remember it won’t have the same durability or flexibility as pure silicone.

Q4: How important is surface preparation before applying silicone sealant?
A4: Extremely important! For the best silicone for sealing windows to adhere properly and last, the surface must be clean, dry, and free of old caulk, paint, dust, or grease. Neglecting this step is the most common reason for sealant failure.

Q5: What are the benefits of using clear silicone for sealing windows?
A5: Clear silicone is popular because it’s virtually invisible, maintaining the aesthetic of your windows and home without drawing attention to the sealant. It won’t yellow over time, making it a great choice for a discreet, long-lasting seal.

Q6: Can I use the same silicone sealant for both interior and exterior window sealing?
A6: Many high-quality silicone sealants, like the GE Advanced or Gorilla Waterproof, are rated for both interior and exterior use. They are designed to withstand varying temperatures and moisture levels. However, always check the product’s specific labeling to ensure it’s suitable for your intended application.

Q7: How do I remove old silicone caulk before applying new silicone?
A7: Removing old silicone can be a bit tricky. You’ll typically need a utility knife or a specialized caulk removal tool to scrape away the bulk of it. For any stubborn residue, a silicone remover product can be applied to soften it, making it easier to wipe away. Always follow product instructions and wear protective gear.