JB Weld RTV Silicone Sealant & Adhesive is a high-quality, room temperature vulcanizing (RTV) silicone ideal for sealing and bonding a wide range of surfaces. This general-purpose silicone is perfect for use in both automotive and household applications. Upon exposure to air moisture, it cures to form a tough, flexible, and waterproof seal that resists weathering, cracking, and shrinking.
Available in multiple colors to suit a variety of needs and finishes:
-
Black, Blue, Clear General-purpose sealing
-
Ultimate Black, Ultimate Grey High-performance automotive-grade formulas
Key Features (All Variants)
- General-purpose RTV silicone versatile for sealing and bonding
- Forms waterproof, flexible seal does not shrink or crack
- Weather-resistant suitable for interior and exterior use
- Sensor safe suitable for modern engines (Ultimate Black & Grey)
- Great for sealing uneven surfaces
- Country of Origin: USA
- Commodity Code: 3506100000
Ultimate Black & Ultimate Grey High Temp Automotive Formulas
Specifically engineered for high-performance automotive applications where high heat and vibration resistance is critical.
Additional Features:
- Temperature Resistance: Up to 500F (260C)
- Sensor Safe: Safe for use with oxygen sensors and other sensitive components
- Set Time: Begins to set in 1 hour, cures fully in 24 hours
Application Instructions
- Prepare Clean and dry surface area thoroughly.
- Apply Dispense a 1/4 continuous bead to one surface; ensure all bolt holes are surrounded.
- Assemble Join parts while silicone is still wet.
- Secure Hand-tighten until sealant begins to squeeze out.
- Dry Allow to dry for 1 hour, then tighten an additional turn.
- Finish Trim excess cured sealant. Full cure achieved in 24 hours.
Ideal Uses
- Valve covers, oil pans, timing covers
- Water pumps, thermostat housings
- Gasket replacement and repairs
- Bonding and sealing metal, glass, ceramic, plastics, and more
- Electrical enclosures and general DIY applications
Pack Dimensions
| Length |
Width |
Height |
Unit Weight |
Boxed Weight |
| 21.5cm |
11.0cm |
3.0cm |
120g |
110g |
FAQs
Q1: Whats the difference between regular Black and Ultimate Black?
A1: Ultimate Black is formulated for higher temperature resistance (up to 500F) and sensor safety, making it ideal for automotive use. Regular Black is more suited to general household applications.
Q2: Is this silicone paintable?
A2: No. Like most silicones, once cured, it is not paintable.
Q3: Can I use it underwater?
A3: This silicone is water-resistant, but it must be fully cured before exposure to water. It is not suitable for continuous underwater use.
Q4: Does it bond to plastic?
A4: Yes, it bonds to most plastics, but performance may vary depending on plastic type. Testing on a small area is recommended.
Summary
JB Weld Silicone Sealant & Adhesive (85g) delivers durable, flexible, and weatherproof bonding and sealing performance across multiple applications. Whether for household fixes or automotive engine repairs, the range of colors and performance levels ensure there’s a perfect match for every task. Trust JB Weld for long-lasting reliability in every seal.
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