Rtv Silicone Highs of 2025
Best Choice1
RUTLAND PRODUCTSRutland 600°F RTV High Heat Silicone, High Temperature Sealant, Black, 10.3 oz Cartridge
Why we love it
Durable and flexible sealing.
Withstands high temperatures.
Adheres to multiple surfaces.
9.8Exceptional
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Value for Money2
LoctiteLoctite 37519 598 Black High Performance RTV Silicone
Main highlights- Reliable, High-Temp Adhesion: This Silicone sealant designed for most surfaces, including passive substrates like stainless steel and aluminum, resisting migrating, shrinking, and cracking
- Quick-setting for convenience: The product begins setting in just 30 minutes giving you a quick start on your project, and reaches its full strength after 24 hours, ensuring a complete and durable cure by the next day
- Oil-Resistant: Retains effectiveness oil contamination from motor oils, corrosion protection oils, and cutting fluids, maintaining strong adhesion
- OEM-Approved Performance: LOCTITE automotive products are not only OEM-specified but also designed and tested by leading auto manufacturers. Trusted by professionals in engine building and repair worldwide (PN: 495075-37519)
- Flexible & Durable: Absorbs shock and enhances load-bearing capabilities, maintaining a strong bond even with movement
9.7Exceptional
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3
Permatex20% OffPermatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 3 oz
Why we love it
Exceptional oil resistance.
Sensor-safe and non-corrosive.
High flexibility for various applications.
9.6Exceptional
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4
RUTLAND PRODUCTSRutland 500°F RTV High Heat Silicone, High Temperature Sealant, Black, 10.3 oz Cartridge
Main highlights- Will adhere to most clean surfaces including: glass, metal, plastics, fiberglass, wood, brick, and stone.
- Seal fireplace inserts, repair solar panels, apply ceramic tiles to your fireplace surround or heat shielding behind your stove, the uses are endless
- Rutland High Temperature Silicone is a great solution to your sealant and adhesive needs
- Rated to withstand up to 500° F (260° C)
- Forms a tough and flexible seal
9.5Excellent
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5
RUTLAND PRODUCTSRutland 500°F RTV High Heat Silicone, High Temperature Sealant, Made in USA, Clear, 10.3 oz Cartridge
9.3 Attachment8.9 Simple to use8.7 worth the moneyWhy we love it
High Temp: 500F/260C
Flexible seal
Adheres to most surfaces
9.3Excellent
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6
J-B WeldJ-B Weld 31914 Red High Temperature RTV Silicone Gasket Maker and Sealant - 10.3 oz.
Main highlights- WHAT THE PROFESSIONALS USE: Builders, mechanics & repair pros know our products bond strong to a variety of surfaces in even the toughest environments. Choose the product pros trust for your project
- VERSATILE & DEPENDABLE: Ideal for automotive, metal, oil pans, exhaust manifolds, water pumps, timing covers, differential covers, drive housings and oven doors
- HI TEMP SILICONE GASKET MAKER & SEALANT: Is an RTV Silicone gasketing material, designed for use in mechanical assemblies where continuous temperatures up to 550º F or 650º F intermittent exist
- EASY TO USE: Curing when the product is exposed to the moisture in air, it forms a tough, waterproof seal on most surfaces. It will not shrink or crack, resists weathering and is sensor safe
- DO IT YOURSELF: Big or small, you can DIY it with J-B. Our heavy duty adhesives repair & restore it right the first time. JB Weld delivers the legendary performance of the World's Strongest Bond.
9.0Excellent
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7
Permatex14% OffPermatex 81409 High-Temp Red RTV Silicone Gasket, 11 oz.
Main highlights- Temperature range of -65F to 650F intermittent
- Temperature Range: -65°F to 650°F (-54°C to 343°C) intermittent
- Suggested Applications: Valve covers, oil pans, timing covers, water pumps, thermostat housings, transmission pans
- Suggested Applications: Valve covers, oil pans, timing covers, water pumps, and thermostat housings
- Replaces almost any cut gasket, and coats pre-cut gaskets to increase reliability
- Replaces almost any cut gasket by making reliable "formed-in-place" gaskets that resist cracking, shrinking and migrating caused by thermal cycling
- Makes reliable 'formed-in-place' gaskets that resist cracking, shrinking and migrating
- Formulated for high temperature applications or heavy-duty use (such as towing); resists auto and shop fluids
- Formulated for hi-temp applications, or heavy-duty use
- Coats pre-cut gaskets to increase reliability
8.9Very Good
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8
Permatex14% OffPermatex 81409 High-Temp Red RTV Silicone Gasket, 11 oz.
Main highlights- Temperature range of -65F to 650F intermittent
- Temperature Range: -65°F to 650°F (-54°C to 343°C) intermittent
- Suggested Applications: Valve covers, oil pans, timing covers, water pumps, thermostat housings, transmission pans
- Suggested Applications: Valve covers, oil pans, timing covers, water pumps, and thermostat housings
- Replaces almost any cut gasket, and coats pre-cut gaskets to increase reliability
- Replaces almost any cut gasket by making reliable "formed-in-place" gaskets that resist cracking, shrinking and migrating caused by thermal cycling
- Makes reliable 'formed-in-place' gaskets that resist cracking, shrinking and migrating
- Formulated for high temperature applications or heavy-duty use (such as towing); resists auto and shop fluids
- Formulated for hi-temp applications, or heavy-duty use
- Coats pre-cut gaskets to increase reliability
8.8Very Good
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9
Silco Incorporated36% OffFood Grade NSF FDA RTV Silicone Sealant Adhesive Red High Temp 10.3oz (Standard Version) (Standard Version)
Main highlights- Waterproof
- Self cureing, easy to apply
- Impervious to all weather conditions
- Food Safe (NSF & FDA Food Grade approval) 650F high temp
- Bonds to All gaskets and all surfaces
8.7Very Good
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10
Red Devil25% OffRed Devil 08090I RD PRO 100% Heat Resistant RTV Silicone Sealant, A Water-Proof and Weatherproof Adhesive For High-Heat Use, 10.1 oz. Tube, Red, 1-Pack
Main highlights- WILL NOT CRACK, SHRINK OR PEEL: With its non-slumping design, water-proof and weatherproof formula, the RTV sealant will withstand the elements and won’t crack, peel or shrink for a dependable seal that lasts for years
- RESISTS EXTREME HEAT EXPOSURE: The RD Pro Industrial Grade Heat Resistant Sealant is formulated with iron oxide to resist extreme heat exposure and withstands temperatures of 600 degrees Fahrenheit (intermittent) & 500 degrees Fahrenheit (constant)
- RED COLOR FOR EASY IDENTIFICATION: Ideal for use in industrial applications, the Heat Resistant Sealant comes in red and can be used on Oven Belts, Industrial Ovens, Oven Windows, Drying Ovens, Boilers, Fired Heaters, Flanged Pipe Joints, Access Doors, Heating Elements in Appliances, and Flues on Gas Appliances
- FOR BEST RESULTS: Before applying the sealant, remove any old caulk, debris, or other residues that might interfere with adhesion and make sure the RTV Sealant is used on clean, dry surfaces for best results
- 50-YEAR PRODUCT DURABILITY GUARANTEE: Depend on Red Devil’s Heat Resistant 100% Silicone Sealant for your projects that deal with extreme heat; the sealant remains flexible and resists vibration with impressive adhesion and provides a water-resistant seal durable for 50-years
8.4Good
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