10 Best Window Caulk Exterior 2026 in the United States

The GE All Purpose Silicone Caulk for Window & Door is a versatile choice for those looking for a durable, weather-resistant sealant. Made from 100% silicone, this caulk offers excellent protection from water damage and is specifically designed to withstand harsh weather conditions, making it ideal for exterior applications. Its strong adhesion ensures it stays put on various materials including metals, woods, glass, and tiles, providing flexibility and durability for both interior and exterior projects.

One of its standout features is that it becomes rain-ready in just 12 hours, which is quite convenient for those in urgent need of weatherproofing their windows and doors. However, it takes a full 24 hours to cure completely, so some patience is required for the final set. Another advantage is that it is freeze and sun-proof, further extending its reliability in different climates.

Despite these strengths, a key limitation is that it is not paintable due to its 100% silicone composition. This means that if color matching is essential for your project, you may need to consider another product. Additionally, while it offers good mold and mildew resistance, it may not be as effective in highly humid environments compared to specialized anti-mold caulks. In terms of convenience, the 10 oz cartridge is user-friendly but requires a caulking gun for application. This product is best suited for those needing a robust, flexible, and weather-resistant caulk for various materials, particularly in climates with severe weather conditions.

The Gorilla Waterproof Caulk & Seal Silicone Sealant is a clear, 100% silicone product designed for both indoor and outdoor use, making it suitable for sealing windows, doors, and other gaps exposed to weather. Its standout strength is excellent weather resistance—it seals out air, water, and moisture effectively, and is ready for water exposure in just 30 minutes, which is faster than many other caulks.

The sealant is also mold and mildew resistant, so it won’t develop unsightly stains or damage over time. It remains flexible, which helps it withstand expansion and contraction around windows without cracking or shrinking. Because it is silicone-based, it does not paint well, so if you plan to paint over your caulking, this might not be the best choice.

The product is versatile and sticks well to many surfaces like wood, metal, glass, and more. This caulk is a strong option when you need a durable, waterproof seal with quick curing for exterior window applications, but if you want to paint over it, you might want to consider a paintable alternative.

The GE Supreme Paintable Silicone Caulk is a strong choice for sealing exterior windows and doors, especially if you're looking for something that stands up well to weather. It's made from 100% silicone, which means it's fully waterproof and resists damage from rain, sun, and freezing temperatures. This makes it a good fit for protecting your home from leaks and drafts in tough weather conditions. One of its key benefits is its flexibility—it’s designed to stretch and move with temperature changes without cracking or shrinking, which helps keep the seal intact over time.

Another plus is its strong adhesion to a wide range of materials like metal, wood, brick, and glass, so it should work well on most surfaces around your windows. The sealant is paintable, allowing you to match your home’s trim or siding colors for a neat finish. It also resists mold and mildew, which is important in areas that get damp or humid. Silicone caulks generally take longer to fully cure than some other types, so it’s advisable to allow sufficient drying time before painting or exposing the sealant to heavy weather.

The packaging offers a decent amount for typical home projects, but the 12-pack is best suited if you have several windows or larger jobs to tackle. This caulk provides strong, flexible, and waterproof sealing with the added benefit of being paintable and mold-resistant, making it a reliable choice for exterior window applications.