Description
Seal It Right with J-B Weld High Temperature RTV Silicone
Whether you’re repairing a leaky valve cover or sealing an exhaust manifold, you need a product that can handle extreme heat and pressure. The J-B Weld 31314 High Temperature RTV Silicone Gasket Maker and Sealant is engineered specifically for those high-demand applications where traditional sealants fall short.
This red, 3 oz tube of RTV (Room Temperature Vulcanizing) silicone forms a strong, flexible, and heat-resistant seal that lasts. Trusted by mechanics, technicians, and DIYers alike, it’s a staple for any serious repair toolkit.
🔧 What Is RTV Silicone?
RTV silicone is a type of silicone rubber that cures at room temperature when exposed to moisture in the air. The J-B Weld high temperature RTV silicone stands out because of its superior temperature resistance, withstanding up to 550°F (287°C) and intermittent exposure up to 650°F (343°C).
It’s sensor-safe, non-corrosive, and excellent for high-vibration and high-heat environments.
🔩 Key Features
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High Temperature Resistant: Up to 550°F continuous, 650°F intermittent
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Flexible & Durable: Won’t shrink, crack, or harden over time
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Sensor-Safe Formula: Safe for use with oxygen sensors
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Waterproof & Oil Resistant: Withstands automotive fluids
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Multi-Surface Compatibility: Bonds to metal, glass, rubber, and more
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Quick Skin Time: Sets in 1 hour, cures in 24 hours
🚘 Ideal Use Cases
J-B Weld 31314 is perfect for sealing and gasketing on:
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Valve covers
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Exhaust manifolds
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Water pumps
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Oil pans
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Thermostat housings
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Timing covers
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Differential covers
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Transmission pans
This makes it incredibly versatile across both automotive and industrial applications.
🛠 How to Apply It
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Clean and dry the surface thoroughly.
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Apply a continuous bead around the mating surface.
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Assemble parts immediately, finger-tight.
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Allow to cure for at least 24 hours before exposing to fluids or extreme temperatures.
Pro tip: Always wear gloves and apply in a well-ventilated area.
⭐ Customer Testimonials
“Used this to seal an exhaust flange—zero leaks and holding strong after months of daily driving.”
— Marcus B., California
“Easy to apply, sets up fast, and doesn’t burn off like cheaper brands. My go-to for anything under the hood.”
— Alina F., Texas
🆚 Why Choose J-B Weld RTV Silicone?
While there are dozens of silicone gasket makers out there, the J-B Weld high temperature RTV silicone is trusted for its industrial-grade performance, sensor-safe properties, and strong resistance to automotive fluids.
Want more? Check out our Website. You can also view more technical specs directly on J-B Weld’s official site
♻ Shelf Life & Storage
Store the unused tube in a cool, dry place with the cap sealed tightly. It has a shelf life of up to 24 months from the date of manufacture. If stored properly, the RTV silicone will remain soft in the tube and ready for your next job.
Compatibility with Other J-B Weld Products
The J-B Weld high temperature RTV silicone works great on its own, but it can also be paired with other J-B Weld products for more comprehensive repairs. For instance, if you’re dealing with a cracked surface around a gasket area, you can first seal the damage with J-B Weld SteelStik or KwikWeld and then finish the job with this RTV silicone for long-term sealing and heat resistance.
Using the products together enhances strength, seals leaks more effectively, and extends the life of your equipment or vehicle components. This modular approach is what makes J-B Weld a preferred brand for both professionals and DIYers.
📦 What’s in the Package
When you purchase the J-B Weld 31314 High Temperature RTV Silicone Gasket Maker, you’ll receive a 3 oz tube with a resealable cap. The nozzle allows for precise application, helping reduce waste and mess. The product is packaged in a clearly labeled blister pack with application instructions on the back — perfect for toolboxes or shelf storage.
🧰 Final Verdict
If you’re sealing high-temperature components and need a gasket maker you can trust, the J-B Weld 31314 High Temperature RTV Silicone is a no-brainer. With excellent adhesion, flexibility, and heat resistance, it outperforms generic sealants and delivers lasting results.
