3M Polyurethane Construction Sealant 525 Gray 310ml Moisture Cure Elastic Sealant for Concrete Joint Sealing

The 3M Polyurethane Construction Sealant 525 is a single-component, moisture-cure elastic sealant engineered for demanding construction applications. Its gray color blends seamlessly with concrete and masonry surfaces, while its flexible, durable bond accommodates joint movement and thermal expansion.

• Color: Gray
• Volume: 310ml cartridge
• Type: Single-component polyurethane sealant
• Cure mechanism: Moisture cure
• Flexibility: Elastic — accommodates joint movement and thermal cycling
• Applications: Concrete joints, expansion joints, construction gaps, masonry sealing
• Paintable: Yes, after full cure
• Brand: 3M

Ideal for contractors and construction professionals requiring a reliable, long-lasting seal on concrete, masonry, and similar substrates.