Primers / Sealants

103 Crack & Joint Sealant

Multi-purpose roof sealant built for cracks and joints

The same proven roof coatings — just with a new name.

Now part of the Gaco family of brands, 103 Crack & Joint Sealant continues to provide the same proven performance contractors have counted on for decades — just with a new name. You can expect the same protection, durability, and ease of use, now backed by Gaco’s expanded portfolio and commitment to building envelope solutions.

This trowel-grade roof sealant spreads easily and tools smoothly. It also adheres strongly to many substrates. Apply it in thin films up to 1/4 inch per application. Then rely on its flexibility to perform in changing conditions.

You can use it on foam roofs, pitched roofs, flat roofs, and parapets. In addition, it works well on stucco, masonry, metal, wood, and plastic. Because it resists sagging on vertical surfaces and avoids cracking or bleed-through, it serves as a reliable alternative to plastic roof cement.

GacoFlex 103 Crack & Joint Sealant delivers outstanding elongation properties. It expands and contracts with the substrate to maintain a constant seal. In addition, it pairs easily with GacoFlex roof coatings, which makes it a versatile choice for roof and building repair. Finally, for UV performance, apply a GacoFlex top coat or try GacoFlex 133 Extreme Crack and Joint Sealant that offers UV resistance without additional coating.

At Gaco, we believe there’s a difference between just any solution and the right solution. You deserve the right solution and Gaco’s team of experts will help you find it! Find 103 near you or contact your local Gaco Area Manager with questions.