Top 8 Sealants to Use on Replacement Windows

You’ve picked out your gorgeous new windows. You know what style you want, the size and color, and when they’re getting installed. Now you just to decide how to seal them.

A good seal is essential for protecting the lifespan of your replacement windows. The gaps in a window can let in the elements and end up raising your energy bill. But like anything you trust for your home, not all sealants are made equal.

replacement window sealants

That’s why it’s important to choose the right one. We’ve taken the guesswork out of your next home improvement project with this list of the best window sealants.


How to choose from all the great products out there? Look for one with proven quality and value. QUAD Max sealant by OSI is far and away a fan favorite. This caulk boasts a consistent application in hot and cold temperatures.

It’s highly flexible so it won’t shrink or form bubbles. And it can go directly on wet surfaces, which is helpful if you’ve been painting or get caught in a summer shower.

2. GE Silicone 2+ Window & Door

Cracks can form as a window frame expands and contracts through the seasons. Many sealants shrink over time, pulling away from the frame. That’s why this GE Silicone 2+ Window & Door Sealant is a good choice for sealing your replacement windows.

Its 100% silicone formula makes it flexible and shrink-proof. This caulk is also quick drying which means you can get right to work. And because it’s weatherproof, you know it’ll last for many years to come.

3. Gorilla 100% Silicone All-Purpose

You want to get your money’s worth from any project you do around the house. This all-purpose sealant by Gorilla is a smart buy since you can use the extra on your kitchen, bath, plumbing, and gutters. It’s even safe for auto and marine repairs.

And unlike clear products that don’t stay that way, this sealant dries clear and won’t discolor with time. You can’t go wrong with the brand known for strong and fast-drying.

4. Loctite PL White Polyurethane

You may be used to seeing it in heavy-duty spray foam, but polyurethane caulk is a great alternative to silicone. This window, door and siding sealant from Loctite is high performing but perfect for keeping a beautiful exterior. It’s even paintable so you can DIY without fear.

Developed specifically for weather resistance, this caulk won’t degrade under the sun. Whatever your window project you want a seal that will endure through rain or shine.

5. Flex Shot Advanced

Don’t worry, this as-seen-on-TV product isn’t all flash and no substance. Flex Shot Clear Advanced Sealant gives you a strong seal without the need for a caulking gun. This rubber sealant dispenses mess-free and bonds to nearly every surface. With its clear finish and easy application, you can tackle your project with confidence.

6. GE Silicone 2+ Gray

Your home isn’t just any home. White caulk conceals easily against the white or off-white siding, but you might need something different. This GE caulk in gray is a good option for projects with color. It would go well with slate, blue, or even moss green exteriors. Life-proof and long-lasting, it has all the benefits of GE Silicone 2+ Window & Door with the versatility of gray.

7. DAP Seal ‘N Peel

Home improvements can feel like a big commitment. You want to get everything just right, but sometimes sealant needs to be redone or you may be looking for a change. That’s why DAP Seal ‘N Peel is such a game changer. It goes on like regular caulk but comes off like a strip when you’re ready. Enjoy the peace of mind that your sealant is working hard but won’t be hard to remove.

8. Ace White Siliconized Acrylic

Finish your project with one of the most trusted names in hardware. Ace offers a window, door and siding caulk in white. At 5.5 ounces, its convenient size makes it good for projects with a smaller perimeter. And because it’s a mix of silicone and acrylic it gives you the best of both. This sealant is flexible, paintable, and at a price point, you can get excited about.

What’s The Best Sealant for Replacement Windows

professional window installer using a sealant

There’s no shortage of products available to seal your replacement windows. And it’s the last thing on your mind when you’re planning a home renovation or refresh. When purchasing caulk, think about how it’ll fit your specific needs. Time-tested formulas guarantee a quality, durable seal. It may seem small but sealant’s a crucial step in making and keeping your home beautiful.

At Feldco, we take care of windows with the best sealant on the market. We use Osi Quad Max sealant on all our replacement windows. As a result, many homeowners who choose to go with Feldco for their window replacement will receive cost-saving benefits and energy efficiency.

Thanks to the well-trained installers, Feldco can replace your windows and apply Osi Quad Max sealant in order to extend the lifespan of the replacement windows. Speak to a product specialist and get a free quote online today.

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