7 honest reviews for the best caulk to seal windows 2025

I’ve spent countless hours tackling drafts, high energy bills, and just generally trying to make my home feel more comfortable. One of the simplest yet most effective DIY projects I’ve found is sealing up those sneaky gaps around windows. It’s amazing how much of a difference a good seal makes, both for your comfort and your wallet. Finding the best caulk to seal windows can feel like a chore with so many options out there, but I’ve put together this guide to help you cut through the noise. We’re going to dive deep into some top contenders, sharing what makes them tick and which situations they’re truly best for, so you can pick the perfect window sealant for your next project.

IMAGE	PRODUCT NAME	AMAZON LINK
	Gorilla Waterproof Caulk & Seal Silicone Sealant, 10oz…	View on Amazon
	Flex Caulk, Waterproof & Weatherproof Hybrid Polymer…	View on Amazon
	GE Advanced Silicone Caulk for Window & Door, Clear, 2.8…	View on Amazon
	GE Advanced Silicone Caulk for Window & Door, White, 10…	View on Amazon
	Dap 18354 Seal ‘N Peel Removable Caulk, 10.1-Ounce	View on Amazon
	GE Supreme Silicone Caulk for Window & Door, Clear, 10…	View on Amazon
	Saker Silicone Caulking Tools-3 in 1 Sealant Finishing Tool…	View on Amazon

1. Gorilla Waterproof Caulk & Seal Silicone Sealant, 10oz

When I’m looking for a sealant that won’t mess around, Gorilla usually comes to mind, and their Waterproof Caulk & Seal Silicone is no exception. This white caulk promises a speedy setup, being ready for water exposure in just 30 minutes, which is super handy if you’re racing against the weather. It’s an all-purpose sealant that truly performs, creating a 100% silicone waterproof seal that’s built to last indoors and out. Plus, it brings that signature Gorilla toughness, resisting mold, mildew, yellowing, shrinking, and cracking over time, ensuring your window seals stay pristine and effective for years.

Key features that stand out:
– Speedy water readiness: Can be exposed to water in just 30 minutes.
– Versatile use: Suitable for both indoor and outdoor applications.
– 100% Silicone as cured: Provides a completely waterproof seal.
– Durable: Resistant to mold, mildew, yellowing, shrinking, and cracking.

Pros:
– Dries quickly for fast protection.
– Excellent all-around performance for various projects.
– Highly durable and long-lasting seal.
– Strong resistance to environmental factors.
Cons:
– Being silicone, it’s typically not paintable, which limits aesthetic options if you want a color match.

Best for: General-purpose window sealing where speed and ultimate durability are key, and a white, non-paintable finish is acceptable.

Expert Opinion: This is a fantastic choice for exterior window frames, especially if you anticipate rain soon after application. Its robust silicone formulation ensures a lasting, weather-tight seal against the elements.

2. Flex Caulk, Waterproof & Weatherproof Hybrid Polymer

Flex Caulk really changes the game for DIYers, especially those who dread wrestling with a caulk gun. This innovative sealant comes in a unique tube with an adjustable trigger flow nozzle, making it incredibly easy to apply without any extra tools. Its advanced hybrid polymer formulation means it sticks to virtually any surface, even wet ones, and creates an exceptional seal against water, air, and moisture. I love that it won’t shrink, crack, or become brittle, offering long-term flexibility, and for those who care about aesthetics, it’s also fully paintable once cured, blending seamlessly with your home’s exterior or interior.

Key features that stand out:
– No caulk gun needed: Features an adjustable trigger flow nozzle for easy application.
– Advanced hybrid polymer: Adheres to virtually any surface, wet or dry.
– Durable: Won’t shrink, crack, or become brittle; UV and chemical resistant.
– Fully paintable: Allows for seamless integration with painted surfaces.

Pros:
– Super user-friendly, great for beginners.
– Exceptional adhesion to a wide range of materials, even in less-than-ideal conditions.
– Highly flexible and durable, ideal for areas with movement.
– Can be painted over for a polished look.
Cons:
– The unique applicator might take a little getting used to compared to traditional caulk guns.

Best for: DIY enthusiasts who want an easy, mess-free application, need excellent adhesion to various materials (even slightly damp ones), and require a paintable finish for their window seals.

Expert Opinion: The paintability and adhesion to wet surfaces make this an incredibly versatile option, particularly for older homes or situations where you can’t guarantee a perfectly dry application surface. It’s a truly forgiving caulk.

3. GE Advanced Silicone Caulk for Window & Door, Clear, 2.8oz

For those smaller window sealing jobs or touch-ups, the GE Advanced Silicone Caulk in a clear, 2.8oz tube is a perfect pick. This 100% silicone formula is a powerhouse, offering complete waterproof and weatherproof protection that’s essential for window integrity. It boasts a 10-year mold-free product protection, resisting stain-causing mold and mildew growth, which is a huge plus in humid areas. I’m always impressed by its permanent flexibility—40% more than Class 25 sealants—and 5X stronger adhesion than GE’s Silicone 1, ensuring it won’t shrink or crack with temperature swings. Plus, it’s rain-ready in just 30 minutes, saving you time and worry.

Key features that stand out:
– 100% Waterproof and Weatherproof: Provides robust protection against the elements.
– 10-Year Product Protection: Resistant to mold and mildew growth.
– Permanently Flexible with Strong Adhesion: Offers 40% more flexibility and 5X stronger adhesion than Silicone 1.
– Quick rain-ready: Ready in as little as 30 minutes.

Pros:
– Ideal for small, precise applications.
– Excellent long-term protection against water and mold.
– High flexibility to accommodate window movement.
– Fast curing for quick results.
Cons:
– The smaller tube size means it’s not cost-effective for larger projects.

Best for: Small window sealing projects, clear seals where aesthetics matter, or touch-ups around existing clear silicone, valuing strong, flexible, and mold-resistant performance.

Expert Opinion: This small tube is fantastic for detail work, like sealing around small pane windows or doing quick repairs. Its clear finish is virtually invisible, making it a great choice when you don’t want the caulk to stand out.

4. GE Advanced Silicone Caulk for Window & Door, White, 10oz

If you loved the sound of the GE Advanced Silicone for Windows & Doors but need a standard size and a classic white finish, this 10oz tube is your answer. Just like its smaller, clear counterpart, it’s a 100% silicone formula that delivers exceptional waterproof and weatherproof protection, designed to stand up to harsh outdoor conditions. You still get that fantastic 10-year mold-free product protection and the impressive flexibility (40% more than Class 25 sealants) and adhesion (5X stronger than Silicone 1) that prevents shrinking and cracking. It’s also rain-ready in a mere 30 minutes, making it a reliable choice for larger window sealing jobs where you need a durable, white, maintenance-free seal.

Key features that stand out:
– 100% Waterproof and Weatherproof: Ultimate protection against water damage and harsh weather.
– 10-Year Mold-Free Product Protection: Cured sealant resists stain-causing mold and mildew.
– Permanently Flexible with Strong Adhesion: Ensures durability against temperature fluctuations.
– Durable: Rain-ready in 30 minutes, resistant to shrinking and cracking.

Pros:
– Standard 10oz size for larger projects.
– Provides a crisp, clean white finish.
– Long-lasting mold and mildew resistance.
– High flexibility and adhesion for a reliable seal.
Cons:
– As a silicone caulk, it’s generally not paintable, which can be a limitation for some projects.

Best for: Standard to larger window sealing projects on homes with white window frames or trim, prioritizing durable, waterproof, and mold-resistant performance.

Expert Opinion: This is a go-to for many professionals for a reason. Its reliability, excellent weatherproofing, and mold resistance make it a smart, long-term investment for keeping your windows sealed tightly.

5. Dap 18354 Seal ‘N Peel Removable Caulk, 10.1-Ounce

Here’s a unique player in the window sealant game: Dap Seal ‘N Peel Removable Caulk. Unlike permanent sealants, this one is all about providing a temporary, removable seal for applications like seasonal window drafts, air conditioner units, or even temporary weatherstripping. Its synthetic rubber formula applies just like regular caulk but can be easily peeled away without needing caulk remover when it’s no longer needed, and importantly, it won’t damage painted surfaces. It forms a watertight, weatherproof seal to help save energy, keeping homes warmer in winter and cooler in summer, and can be used both indoors and outdoors.

Key features that stand out:
– Temporary, removable seal: Easily peels away when no longer needed without damaging surfaces.
– Synthetic rubber formula: Applies like caulk, performs like weatherstripping.
– Energy-saving: Forms a watertight, weatherproof seal for multi-season use.
– Interior/exterior use: Versatile for various temporary sealing needs.

Pros:
– Perfect for temporary sealing needs without commitment.
– Doesn’t damage paint or surfaces upon removal.
– Easy to apply and remove.
– Effective for seasonal energy saving.
Cons:
– Not designed for permanent, long-term structural sealing.

Best for: Renters, temporary sealing around window AC units, seasonal draft-proofing, or anyone who needs a flexible, removable best caulk to seal windows solution that won’t leave a trace.

Expert Opinion: This caulk is a fantastic niche product. If you’re a renter, or if you install a window AC unit every summer, this is your secret weapon. It prevents drafts and bugs without the hassle of permanent removal later.

6. GE Supreme Silicone Caulk for Window & Door, Clear, 10oz

Stepping up from the “Advanced” line, the GE Supreme Silicone Caulk is engineered for those who demand the absolute best in window sealing. This 100% silicone formula offers unparalleled protection, guaranteeing a reliable seal even in the most weather-prone areas. What truly sets it apart is its lifetime product protection against stain-causing mold and mildew, giving you ultimate peace of mind. It boasts an incredible 40% more flexibility than Class 25 sealants and a whopping 7X stronger adhesion than GE’s Silicone 1, making it virtually shrink and crack proof. When you’re looking for the ultimate in durability and performance for your window seals, this clear, 10oz tube delivers.

Key features that stand out:
– 100% Waterproof and Weatherproof: Offers the highest level of protection from water damage.
– Lifetime Product Protection: Against stain-causing mold and mildew growth.
– Permanently Flexible with Superior Adhesion: 40% more flexibility and 7X stronger adhesion.
– Shrink and Crack Proof: Designed to withstand extreme temperature fluctuations.

Pros:
– Top-tier durability and longevity with lifetime protection.
– Exceptional flexibility to handle building movement.
– Strongest adhesion for a bond that lasts.
– Clear finish for an invisible seal.
Cons:
– Higher price point compared to standard silicone caulks.

Best for: Premium window sealing projects where maximum durability, long-term mold resistance, and superior flexibility are non-negotiable, especially for high-exposure areas or custom windows. This is truly one of the best caulk to seal windows for a lifetime.

Expert Opinion: If you’re sealing a window you absolutely never want to touch again, this is the caulk. Its “Supreme” designation isn’t just marketing; it truly offers superior performance, making it worth the extra investment for critical applications.

7. Saker Silicone Caulking Tools-3 in 1 Sealant Finishing Tool

Alright, while not a caulk itself, the Saker Silicone Caulking Tools-3 in 1 Sealant Finishing Tool is an absolute game-changer for achieving a professional finish when you’re applying the best caulk to seal windows. I’ve often seen DIYers struggle with messy caulk lines, but this tool makes all the difference. It cleverly combines three functions: an internal angle scraper, a flat angle scraper, and a silicone smoother. It features a sharp stainless steel blade for removing old caulk, a nice silicone trowel for smoothing, and white silicone pads for flawless application of new caulk. It effectively helps you remove old sealant, repair gaps, and apply new caulk neatly without needing masking tape. It’s truly a must-have companion to any of the window sealants listed above.

Key features that stand out:
– 3-in-1 functionality: Combines an internal angle scraper, flat angle scraper, and silicone smoother.
– Durable materials: Features a sharp stainless steel blade for old caulk removal and silicone trowels for smoothing.
– Effectiveness: Helps achieve clean, smooth caulk lines easily, saving time and effort.
– Versatile usage: Ideal for various sealing projects including windows, sinks, and floors.

Pros:
– Significantly improves the quality and neatness of caulk lines.
– Makes caulk removal and application much faster and easier.
– Reduces the need for masking tape and extra cleanup.
– Durable construction for long-term use.
Cons:
– The plastic end can wear down on very hard surfaces, requiring careful use.

Best for: Anyone applying caulk, from seasoned pros to first-time DIYers, who wants to achieve clean, smooth, professional-looking caulk beads around their windows and other areas.

Expert Opinion: Don’t skip a tool like this! Even the best caulk to seal windows can look bad if not applied and smoothed properly. This Saker tool will elevate your finish from amateur to professional, making your effort truly shine.

Helpful Comparison Short Insights

When choosing the best caulk to seal windows, remember that silicone caulks like the Gorilla and GE options offer superior flexibility and weather resistance, making them excellent long-term choices for exterior window seals. They’re generally not paintable, so pick your color carefully. For instance, the GE Supreme Silicone offers the highest level of durability and protection, making it ideal for critical applications.

If paintability is a must-have, the Flex Caulk hybrid polymer is a strong contender, also offering fantastic adhesion to various surfaces, even wet ones. It’s also incredibly user-friendly since you don’t need a caulk gun.

For temporary sealing needs, especially if you’re a renter or dealing with seasonal drafts, Dap Seal ‘N Peel Removable Caulk is absolutely brilliant. It provides a good seal without the commitment or potential surface damage of permanent options.

And don’t forget, no matter which best caulk to seal windows you choose, a good caulking tool like the Saker 3-in-1 will make all the difference in achieving a clean, professional finish. It truly transforms a messy job into a precise one.

Final Verdict

Choosing the best caulk to seal windows really comes down to your specific needs. For ultimate, long-term exterior durability and weatherproofing, especially if you want a clear or white finish that won’t be painted, the GE Supreme Silicone stands out as the top-tier choice. Its lifetime protection and superior flexibility are hard to beat. If you need robust performance but want a slightly more budget-friendly and quick-drying option, the Gorilla Waterproof Caulk & Seal Silicone or the GE Advanced Silicone (10oz white or 2.8oz clear for small jobs) are fantastic reliable choices.

If you value ease of application and paintability, the Flex Caulk Hybrid Polymer is a stellar option that adheres incredibly well to almost anything. And for those unique temporary sealing scenarios where you need a removable solution, the Dap Seal ‘N Peel Removable Caulk is a truly ingenious product. Whichever caulk you pick, remember that good prep work and a handy Saker 3-in-1 Caulking Tool will ensure your windows are sealed efficiently and effectively, saving you energy and boosting your home’s comfort for years to come.

FAQ Section

Q1: When is the best time to apply caulk to my windows?
A1: The best caulk to seal windows should be applied when temperatures are moderate, ideally between 40-90°F (4-32°C), and when there’s no rain in the forecast. This allows the caulk to cure properly and ensures optimal adhesion. Avoid extreme heat or cold.

Q2: How do I prepare my windows before applying caulk?
A2: Proper preparation is key! First, remove all old, loose, or cracked caulk using a utility knife and a caulk removal tool. Clean the area thoroughly with a wire brush or scraper, then wipe away any dust, dirt, or debris with a damp cloth. Ensure the surface is completely dry before applying your chosen best caulk to seal windows.

Q3: What’s the difference between silicone and acrylic caulk for sealing windows?
A3: Silicone caulk, like the Gorilla and GE options reviewed, offers superior flexibility, water resistance, and durability, making it ideal for exterior window seals. It typically isn’t paintable. Acrylic (latex) caulk is water-based, easier to clean up, and generally paintable, but it’s less flexible and durable than silicone, making it better suited for interior gaps or areas less exposed to the elements. For the best caulk to seal windows externally, silicone is usually preferred.

Q4: How long does caulk last around windows?
A4: The lifespan of caulk depends on its type and exposure. High-quality silicone caulks, like GE Supreme, can last 20-50 years or even come with a lifetime guarantee. Acrylic caulks typically last 5-10 years. Regularly inspect your window seals (at least once a year) and reapply the best caulk to seal windows as needed if you see cracks, peeling, or gaps.

Q5: Can I paint over all types of caulk?
A5: No, not all types of caulk are paintable. 100% silicone caulks are generally not paintable, as paint won’t adhere to them properly. Hybrid polymer caulks (like Flex Caulk) and acrylic latex caulks are typically paintable. Always check the product label to ensure compatibility before painting over your best caulk to seal windows.

Q6: Why is sealing windows important for my home?
A6: Sealing windows is crucial for several reasons! It improves energy efficiency by preventing drafts and heat loss/gain, which can significantly lower your heating and cooling bills. It also enhances comfort by eliminating cold spots, reduces noise from outside, and protects your home from moisture infiltration, preventing potential water damage and mold growth. Using the best caulk to seal windows is a small investment that yields big returns.