Choosing the best caulk for sealing exterior windows means balancing weather protection, flexibility, appearance, and whether you need to paint the finished bead. A 100% silicone sealant is a strong choice for a durable, water-resistant joint, while a paintable silicone-acrylic formula can make more sense when the caulk needs to match your trim. The picks below include options for larger jobs and small touch-ups.
Table of Contents
Quick Comparison
| Product | Type | Standout feature | Best suited for |
|---|---|---|---|
| GE Advanced Silicone Caulk, Clear, 2.8 fl oz | 100% silicone | Waterproof seal; small tube | Clear, limited-area repairs |
| GE Advanced Silicone Caulk, White, 10.1 fl oz | 100% silicone | Flexible seal in a larger cartridge | White window and door joints |
| Gorilla 100% Silicone Sealant, Clear, 2.8 fl oz | 100% silicone | Small tube designed for touch-ups | Quick repairs and narrow gaps |
| Red Devil Window & Door Silicone Acrylic, White | Silicone-acrylic | Paintable, with water cleanup | Trim that needs a painted finish |
| GE Supreme Paintable Silicone Caulk, White | Paintable silicone hybrid | Combines waterproofing with paintability | Jobs needing a paintable, flexible seal |
Our Picks: Best Caulk For Sealing Exterior Windows reviews
1. GE Advanced Silicone Caulk, Clear: Best for Small, Discreet Seals
This clear, 100% silicone sealant is a practical choice when you need to seal a small area around a window without adding a white bead. Its 2.8-ounce tube is suited to a limited repair or touch-up, rather than caulking several large windows.
GE lists waterproof and weatherproof protection, permanent flexibility, and resistance to shrinking and cracking as key features. The product is rain-ready in as little as 30 minutes, according to the supplied product information. That short wait can be useful for exterior work, but follow the package directions and consider the actual weather and bead conditions before exposing fresh caulk to rain.
The main trade-off is that a small tube may not be the economical or convenient format for a larger project. Also, clear silicone is not the right pick if you need to paint over the finished bead. Choose a paintable formula instead when color matching is part of the job.
Pros:
- Clear finish can blend in around many window frames.
- 100% silicone formula is waterproof and weatherproof.
- Designed to remain flexible and resist shrinking or cracking.
- Small tube works for limited repairs and touch-ups.
Cons:
- Small tube is less suitable for multiple windows or long joints.
- Not the best choice when you need a paintable bead.
Verdict: Choose this GE tube for a small exterior repair where a clear, flexible silicone seal is more important than paintability.
2. GE Advanced Silicone Caulk, White: Best for Larger White Joints
This white 10.1-ounce cartridge is the larger-format counterpart to GE’s clear tube. It is intended for window and door sealing and makes more sense when you have a longer joint or several areas to caulk. You will need a compatible caulk gun to apply a cartridge of this size.
The 100% silicone formula is described as waterproof, weatherproof, and permanently flexible. GE also states that it is rain-ready in as little as 30 minutes and resists shrinking and cracking as temperatures change. Its white finish can suit white frames or trim, but check the color against the surrounding surfaces before starting; silicone is generally not paintable.
Compared with the clear 2.8-ounce tube, this cartridge offers more material for a broader job but is less convenient for a tiny repair. Its low-odor, neutral-cure description may be useful when the work continues indoors, though exterior application still calls for following the product label and using appropriate ventilation.
Pros:
- Larger cartridge suits longer joints and multiple sealing areas.
- White finish works with compatible frames and trim.
- Waterproof silicone remains flexible as surfaces move.
- Product information states it can become rain-ready in as little as 30 minutes.
Cons:
- Requires a caulk gun.
- Not intended for painting over the cured bead.
Verdict: Pick this GE cartridge for larger exterior window jobs where white silicone is a suitable finish and paintability is not needed.
3. Gorilla 100% Silicone Sealant: Best for Small Touch-Ups
Gorilla’s clear 2.8-ounce silicone sealant is aimed at small repairs around window and door frames, siding, trim, vents, and exterior gaps. Its compact tube is easier to reserve for touch-ups than a full cartridge, and the clear color can help keep a repair visually subtle.
The listed features include a waterproof seal, flexibility, and resistance to shrinking or cracking. The product can be water-ready in as little as 30 minutes under the stated conditions: a 3/16-inch bead at 70°F and 50% humidity. That qualification matters, since thicker beads or different weather may change how quickly a seal is ready for water.
The instructions call for cutting the nozzle at a 45-degree angle and fully puncturing the inner foil seal. Those steps help prepare the tube, but neat application still depends on careful bead control and surface preparation. Like other 100% silicone choices here, it is not the pick for a joint that needs to be painted.
Pros:
- Compact tube is suited to touch-ups and small gaps.
- Clear, waterproof seal for indoor or outdoor use.
- Designed to stay flexible through seasonal movement.
- Water-ready timing includes specific bead and weather conditions.
Cons:
- Limited quantity is not ideal for sealing many windows.
- Not a paintable option.
Verdict: Choose Gorilla’s tube for a small clear repair when you want silicone flexibility and can work within the stated application conditions.
4. Red Devil Window & Door Silicone Acrylic: Best for Paintable Trim
Red Devil’s white silicone-acrylic caulk is a paintable alternative to the 100% silicone products in this list. That can be helpful when you want the seal around a window to match painted trim. The 10.1-ounce cartridge is sized for a larger job and calls for a caulk gun.
The supplied product details describe it for interior and exterior use, with adhesion to multiple surfaces, water cleanup, and a claimed 35-year durability. Because this is a silicone-acrylic formula rather than 100% silicone, it is a different option for shoppers who value paintability and easier cleanup. For maximum weather exposure, compare its label directions with the specific needs of your window joint.
This product is a sensible choice for painted trim and general sealing, but it is not the same type of sealant as the fully silicone options. If your top priority is a 100% silicone waterproof seal, consider one of the GE or Gorilla products instead. Always let the caulk reach the stage required by its instructions before painting or exposing it to water.
Pros:
- Paintable white formula suits painted window trim.
- Water cleanup is listed as a feature.
- Cartridge format is useful for larger or multiple jobs.
- Intended for interior and exterior use.
Cons:
- Not a 100% silicone formula.
- Requires a caulk gun and careful attention to label instructions.
Verdict: Pick Red Devil when matching the caulk to painted trim matters more than choosing a 100% silicone sealant.
5. GE Supreme Paintable Silicone Caulk: Best Hybrid for Paintable Waterproofing
GE Supreme is a white paintable silicone product designed to combine waterproof performance with a finish that can be painted. Its 9.5-ounce size is suited to a moderate window-sealing project, and the cartridge format requires a caulk gun.
GE describes the formula as permanently flexible and waterproof, with resistance to shrinking and cracking. The product information states that it can be paint-ready and water-resistant in as little as 30 minutes. Check the packaging for the right conditions and instructions for your application, especially before painting or exposing the bead to rain.
Compared with the standard GE Advanced Silicone, this is the more versatile choice when the finished joint must take paint. The trade-off is that you should follow the product’s paint and cure directions closely; do not assume that every paint or application condition will behave the same way. Its white color is also a consideration if you plan to leave the seal unpainted against a different finish.
Pros:
- Paintable silicone formula helps match surrounding trim.
- Waterproof and permanently flexible, according to the product details.
- Listed as paint-ready and water-resistant in as little as 30 minutes.
- Cartridge size suits more than a tiny touch-up.
Cons:
- Requires a caulk gun.
- White may not blend with darker or clear-finished frames unless painted.
Verdict: Choose GE Supreme when you want a flexible, waterproof seal around exterior windows and need the option to paint over it.
How to Choose Caulk for Exterior Windows
Match the formula to the finish
Start by deciding whether you need to paint the caulk. The GE Advanced and Gorilla options are 100% silicone and are best considered when you want a clear or white seal without painting over it. Red Devil’s silicone-acrylic formula and GE Supreme are paintable choices. Check the product label to confirm that the caulk is suitable for your surface and planned finish.
Choose the right color
Clear caulk can be less noticeable around some frames, while white may suit white window trim. Neither color is universal: a visible bead can stand out if it does not match the surrounding material. If you plan to paint, a paintable option gives you more flexibility to coordinate the finished joint.
Consider how much caulk the job needs
A 2.8-ounce tube is convenient for a small gap or a short repair. A cartridge around 10 ounces is more appropriate for longer joints or several windows, but it requires a caulk gun. Estimate the total length of the joints before choosing a package so you do not run short partway through the work.
Allow for movement and weather
Window frames and surrounding materials can move as temperatures change. A flexible sealant is useful for joints that experience that movement. Product descriptions may give a short rain-ready or water-ready time, but those claims can depend on bead size, temperature, humidity, and application. Follow the label and avoid exposing fresh caulk to rain sooner than directed.
Prepare the joint before applying caulk
Remove loose, failed caulk and debris, then prepare the surface as directed on the product label. A clean, sound joint gives the new bead a better chance to adhere. Apply the caulk only to the intended joint, and do not seal drainage openings or weep holes that are designed to let water escape from the window system.
Check compatibility and application directions
Window assemblies can include glass, metal, wood, masonry, and composite materials. Confirm that the selected caulk is suitable for the surfaces you are sealing. Follow the instructions for nozzle preparation, bead size, tooling, cure time, painting, and cleanup. If the existing window or siding system has specific sealing instructions, use those as your guide.
Frequently Asked Questions
What type of caulk is best for exterior windows?
A flexible sealant rated for exterior use is a good starting point. 100% silicone is suited to waterproof, weather-exposed joints when you do not need to paint over the bead. For painted trim, consider a paintable silicone-acrylic or paintable silicone product and confirm the exterior-use directions on the label.
Can you paint over 100% silicone caulk?
These GE Advanced and Gorilla products are 100% silicone and are not the paintable options in this selection. If you need a painted finish, choose a product specifically described as paintable, such as GE Supreme or Red Devil, and follow its paint timing instructions.
Is clear or white caulk better around a window?
It depends on the frame and the look you want. Clear can be less noticeable against some surfaces, while white may blend with white frames or trim. If the bead needs to match a custom color, a paintable formula may be more suitable.
How soon can exterior window caulk get wet?
It depends on the product and application conditions. Some options listed here state that they can be ready for rain or water in as little as 30 minutes, but that timing is not a guarantee for every bead or weather condition. Check the package directions before applying caulk when rain is possible.
Can I apply new caulk over old caulk?
For a reliable repair, remove loose or failed caulk and prepare the joint according to the new product’s instructions. Applying a fresh bead over deteriorated material can leave a weak surface underneath. Take care not to damage the window frame or surrounding finish while removing old caulk.
Should I caulk every gap around a window?
No. Seal the intended exterior joints, but do not cover weep holes or other drainage openings. Those openings help water escape from parts of the window system. If you are unsure which gaps are meant to drain, check the window manufacturer’s guidance before sealing them.
Final Recommendation
For a durable, paintable seal around exterior windows, GE Supreme is the most flexible fit in this group because it combines a paintable finish with waterproof performance. Choose GE Advanced Silicone in the larger white cartridge for a broader job where paintability is not needed, or one of the small clear tubes for a limited touch-up. If you need to paint the bead and prefer a silicone-acrylic formula, Red Devil is another practical option. Match the product to your frame, surface, and weather conditions, and follow the package directions for preparation and cure time.
