Best Polyurethane Adhesives of 2025

The Gorilla Original Gorilla Glue is a versatile and incredibly strong adhesive that can bond to almost anything. Its water-activated polyurethane formula expands into materials to form a 100% waterproof bond that can withstand outdoor elements. This glue can be used to bond wood, stone, metal, ceramic, foam, glass, concrete, and more. It expands 3 times into the materials, making it incredibly strong, and can hold up through hot and cold temperatures.

The 3M Marine Sealant is a reliable solution for bonding various marine surfaces, such as wood, fiberglass, and metal. Its versatile design makes it perfect for applications like deck housings and hull fittings, ensuring a strong and flexible bond. You can trust this sealant to withstand harsh conditions, as it effectively resists saltwater and weathering. Additionally, the flexible nature of the bond allows it to absorb stress from vibrations and temperature changes, providing peace of mind for your boat or RV repairs.

Gorilla Clear Glue is a powerful adhesive that is perfect for all your bonding needs. It is crystal clear, non-foaming, water resistant, and incredibly strong. The crystal clear feature ensures that your projects will look clean and professional. The non-foaming property prevents messy and uneven application, making it easy to use. The water resistance feature ensures that your bonds will hold up even in wet or humid conditions. And with its incredible strength, this glue can bond virtually everything, including wood, stone, metal, ceramic, foam, glass, and more. Whether you are working on a DIY project or repairing broken items, Gorilla Clear Glue is the reliable adhesive you need.

The Gorilla Waterproof Glue is a powerful adhesive that excels in tough repair tasks on various surfaces, both inside and outside your home. Its waterproof formula ensures that it remains effective even when exposed to rain or humidity, making it ideal for outdoor projects. You can easily bond materials like wood, stone, metal, and glass, providing you with a versatile solution for all your crafting and repair needs. Additionally, this glue expands three times within the materials, creating an exceptionally strong bond that you can trust for long-lasting results.

SIKA Sikaflex-221 Black Multi-Purpose Sealant/Adhesive is a high-performance, highly elastic 1-C formulation sealant that can be used for making permanent elastic seals with high adhesive strength. It is resistant to weathering exposure, lower in VOCs, and approved for drinkable water and incidental food contact. This sealant bonds well to a wide variety of substrates, including wood, metals, metal primers and paint coatings (2-c systems), ceramic materials, and plastics. It is ideal for panel sealing and bonding, root base sealing, nacelle sealing, tower sealing, installation and perimeter sealing, general metal construction sealing, and flooring bonding.

Gorilla Clear Glue is your go-to adhesive for all your bonding needs. This glue effectively sticks a wide variety of materials, including wood, metal, and glass, making it versatile for various projects. Its crystal-clear finish ensures that your repairs are nearly invisible, perfect for those delicate tasks. Additionally, the non-foaming formula means you won’t have to deal with messy overflows during application. Plus, its water-resistant properties give you confidence that your bonds will hold up against moisture, making it ideal for both indoor and outdoor use. With Gorilla Clear Glue, you can tackle any project with ease.

3M Polyurethane Sealant is a high-strength adhesive that creates powerful bonds on a wide variety of surfaces. It works excellently for bonding both alike or dissimilar materials and can be used confidently as a replacement for mechanical fasteners or rivets. With a skin time of 50-60 minutes, this sealant is ready to accept paint soon after the complete formation of the skin. It possesses great UV resistance, high tensile strength, mid-range Shore A hardness, and permanent elasticity, making it an ideal solution for installations or long-term repairs. Highly effective in panel bonding, attaching exterior panels/metal framework, vehicle flooring attachment, and transportation manufacturing, this polyurethane sealant offers convenience and reliability in a range of applications.

The SIKA Construction Adhesive is your go-to solution for various outdoor projects. It creates a robust bond that remains flexible, preventing cracks during changing weather conditions. With its quick curing time, you can finish your tasks faster, making it ideal for busy DIYers. Additionally, this adhesive is non-corrosive, ensuring a safe and easy application process. You can use it on multiple surfaces, including wood, metal, and glass, providing versatility for all your bonding needs. Enjoy long-lasting durability and flexibility with this waterproof adhesive that withstands the elements.

Gorilla Waterproof Glue is an incredibly strong and versatile adhesive that is perfect for tough repairs on dissimilar surfaces. Whether you need to fix something indoors or outdoors, this glue has got you covered. Its 100% waterproof formula ensures that it doesn't break down when exposed to outdoor elements, making it ideal for both indoor and outdoor use. With its versatility, it can easily bond various materials such as wood, stone, metal, ceramic, foam, glass, and concrete. The glue expands 3 times into the materials, forming an incredibly strong bond. With Gorilla Waterproof Glue, you can trust that your repairs will last.

The 3M Polyurethane Sealant 540, Gray, is a one-component, moisture-curing sealant that provides multi-purpose bonding and long-lasting seals. It remains permanently elastic to allow joint movement and has a skin time of 60-90 minutes. Once a skin forms, it can be painted. The sealant has good UV resistance and bonds dissimilar materials, which increases design flexibility.