Boss Pro | 31580 | 8 oz / 236 mL Clear 315 100% RTV Silicone Sealant

The Boss Pro 31580 315 RTV Silicone Sealant is a professional-grade, 100% RTV acetoxy-cure silicone adhesive and sealant formulated for demanding sealing, bonding, and gasketing applications. Packaged in an 8 oz (236 mL) squeeze tube, this clear, paste-like sealant cures upon exposure to atmospheric moisture to form a durable, flexible rubber seal with outstanding resistance to weather, vibration, moisture, ozone, and extreme temperatures.

Designed for indoor and outdoor use, Boss 315 adheres to clean metal, glass, ceramic, wood, silicone rubber, many plastics, and other common construction materials. It is ideal for sealing windows, marine applications, HVAC equipment, appliances, and general maintenance where a long-lasting waterproof seal is required.

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Key Features

• 8 oz (236 mL) tube of clear 100% RTV silicone sealant

• One-component acetoxy-cure formulation

• Waterproof, weatherproof, and UV-resistant

• Flexible, durable rubber seal after curing

• Excellent adhesion to metal, glass, ceramic, wood, and many plastics

• Service temperature range from -40°F to 400°F (-40°C to 204°C)

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Product Overview

Boss Pro 315 RTV Silicone Sealant is engineered to provide dependable sealing and bonding in applications exposed to moisture, vibration, and temperature extremes. The non-sag, paste-like consistency allows application on horizontal, vertical, and overhead surfaces without running, while the cured silicone remains flexible to accommodate movement without cracking. Typical performance includes a 10–20 minute tack-free time, 24-hour cure, 350 psi tensile strength, and 500% elongation, making it suitable for a wide variety of industrial, marine, automotive, HVAC, and general maintenance applications.

Common uses include sealing appliance components, ductwork, pipe joints, marine cabins, windows, formed-in-place gaskets, and equipment housings. The clear formulation creates a clean, professional appearance while providing long-lasting protection against water, weather, and aging. Always apply to clean, dry surfaces and follow the manufacturer's curing recommendations for best performance.