🔧 Seal smart, last long — the pro’s choice for flawless finishes!
OSI HM270 Construction Silicone Sealant is a durable, one-part RTV silicone designed for sealing non-porous materials. It cures at room temperature, offering excellent adhesion without primer, superior elasticity with ±25% joint movement, and resistance to extreme temperatures (-60°F to 400°F) and UV exposure. Ideal for weatherproof, watertight seals on glass, ceramics, aluminum, and more.
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