10 Best Exterior Caulks 2025 in the United States

The Gorilla Clear Sealant, with its 10-ounce capacity and clear finish, offers good performance for general exterior caulking needs. One of its standout features is the fast full cure time of just 30 minutes, which is quite efficient compared to other sealants that may take longer to cure. This can be particularly beneficial for users looking to complete their projects quickly. The product is also manufactured by the reputable Gorilla Glue Company, adding to its credibility and trustworthiness.

Moreover, the sealant's transparency makes it versatile for various applications without altering the appearance of the surfaces it is applied to. This product is ideal for general sealing tasks around the home and for those who need a quick-curing, clear option. Users should consider additional requirements, such as flexibility and extreme weather resilience, if their projects demand it.

The Gorilla Waterproof Caulk & Seal 100% Silicone Sealant is a versatile and durable option for anyone needing to seal out water, air, and moisture. Its standout feature is its quick curing time; it becomes water-ready in just 30 minutes, which is an excellent advantage for those needing a fast solution.

Additionally, its mold and mildew resistance ensures long-lasting performance without yellowing, shrinking, or cracking, making it suitable for both indoor and outdoor use in various weather conditions. The flexibility and strong adhesion of this sealant allow it to be used on a wide range of surfaces, including stainless steel, wood, glass, and more.

However, it should be noted that being 100% silicone, this sealant may not be paintable, which can be a limitation if you want to match the color of the sealed area with the surrounding environment. The 10-ounce cartridge size is standard but might not be enough for larger projects. This product is excellent for quick repairs and versatile applications, especially where durability and resistance to elements are critical.

The OSI Quad Max Window, Door and Siding Sealant is a high-performing exterior caulk that offers several impressive features. It stands out for its strong adhesion to various materials and exceptional resistance to environmental factors like UV rays, dirt, dust, and extreme temperatures. This makes it a reliable choice for outdoor applications where the sealant is exposed to harsh conditions. Additionally, its ability to be applied on wet surfaces offers greater flexibility during installation.

The product's 5x stretch and Class 50 Joint Movement capability ensure long-term durability without shrinkage or bubbling, making it suitable for areas prone to movement or stress. One of its notable strengths is the fast cure time – it's paintable within just one hour and fully cures in 24 hours, allowing for quicker project completion and effective protection against air and moisture infiltration. This feature is particularly beneficial for contractors and homeowners looking to expedite their projects.

Another advantage is the availability of training and support from OSI, which includes best practice guides and installation training programs, ensuring users can achieve optimal results. On the downside, the sealant comes only in a clear color, which might not be ideal for all aesthetic preferences. Additionally, while the product is marketed as a professional choice, it might be overkill for simple, DIY home repairs where a less robust option could suffice. The sealant is packaged in a 9.5 fl oz cartridge, making it necessary to have a caulking gun for application, which could be a limitation for some users. However, for those needing a durable and flexible sealant capable of withstanding extreme conditions, the OSI Quad Max is a strong contender.