10 Best High Temp Silicone Exhaust Sealant in The UK

Last updated on 03/08/2025

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Best Choice

9.8

Exceptional

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VOKY

Granville 0458 200ml High Temp Instant Gasket Can - Black

6% Off

Why We Love It

Superior, high-quality material.
Promises exceptional performance.
Enhances everyday experiences.

Main Highlights

Premium Product

Permatex 81160 High-Temp Red RTV Silicone Gasket: Suitable for Exhaust Manifold, Header, Turbochargers & Slip Fit Exhaust Parts, Temperature Resistant (up to 343°C), Sensor Safe, Non-Corrosive 1 x 85g

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Why We Love It

Handles high-temperature applications reliably.
Replaces nearly any gasket.
Prevents cracking and shrinking.

Main Highlights

Formulated For Hi-Temp Applications, Or Heavy-Duty Use
Replaces Almost Any Cut Gasket.
Coats Pre-Cut Gaskets To Increase Reliability
Makes Reliable 'Formed-In-Place' Gaskets That Resist Cracking, Shrinking And Migrating
Temperature Range Of -65F To 650F Intermittent

Works on various materials.
High temperature resistance.
Perfect for automotive applications.

Main Highlights

UNIVERSAL MATERIAL：This black silicone sealant can work on all metal, such as stainless steel, aluminum, brass even it is plated or contaminated by minor oils. Also it works on glass, wooden object and anywhere need to seal. They will set completely after 24H.
HIGH QUALITY：Our RTV (Room Temperature Vulcanized) silicone sealant is a product you can depend on again and again. Safe, low odor and superior adhesion, endure temperatures up to -60º C ~ 280º C.
TYPICAL APPLICATION：Ideal for automotive, motorbike, all kinds of metal, oil pans, exhaust manifolds, water pumps, timing covers, differential covers, drive housings, oil pans, valve covers, thermostat housing, mechanical assemblies, machine equipment, 3D printer, oven doors, refrigerator seals, pipe joints, valves and fittings seals.
HOW IT WORKS：Clean the surface of gasket or o-ring, coat our sealant on the gasket and put it where it is. It will form a tough and waterproof seal between tiny gap when the product is exposed to the moisture in air. It will not shrink, drip, run, leak and crack, resists any weather.
BEST SERVICE：Search for Realth on Amazon for more products such as Instant Adhesive, Double Sided Mounting Tape, Duct Tape, Double Sided Nano Tape, Threadlocker. If you want the perfect tools to maintain, repair or clean your vehicle, we have what you need.

S/S Permatex - Ultra Copper - RTV Silicone Gasket Maker - Exhausts to 700oF - 85g

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Why We Love It

Highly oil resistant silicone.
Exceptional flexibility and adhesion.
Wide temperature range compatibility.

Main Highlights

Most advanced, high temp RTV silicone gasket available
Three times more oil resistant than conventional silicones; eight times more flexible than cut gaskets
Sensor-safe, low odor, and non-corrosive with superior adhesion
Temperature range -75F to 700F intermittent
Suggested Applications: Exhaust manifolds/headers, valve covers, oil pans, timing covers, water pumps, thermostat housings

J-B Weld 31314 High Temperature RTV Silicone Gasket Maker and Sealant - Red - 3 oz.

11% OffFree Shipping

Why We Love It

Handles high, continuous temperatures well.
Provides world's strongest bonds.
DIY-friendly and versatile.

Main Highlights

HI TEMP RED SILICONE GASKET MAKER & SEALANT: Is an RTV (Room Temperature Vulcanized) Silicone gasketing material, designed for use in mechanical assemblies where the existence of higher, continuous temperatures up to 550º F or 650º F intermittent might exist
COUNT ON US: For more than 40 years, our products have earned a loyal following from people who take pride in their work. With each product we innovate, we continue to provide the world's strongest bond for your projects
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
VERSATILE & DEPENDABLE: Ideal for automotive, metal, oil pans, exhaust manifolds, water pumps, timing covers, differential covers, drive housings and oven doors
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

Everbuild EVBPCHEATSIL Heat Resistant Silicone Sealant, Black, 310 ml

30% OffFree Shipping

Why We Love It

Ideal for high-temperature areas.
Quick drying and flexible finish.
Completely waterproof when cured.

Main Highlights

SUITABLE FOR HIGH-TEMPERATURE AREAS – Use it on domestic and commercial ovens, chimneys, gaskets and more where the temperatures reach extremes.
QUICK CURING – Dries to a tack-free skin in within 1 hour and completely cures to a permanently flexible finish at a rate of 3mm per 24 hours.
100% WATERPROOF – Once fully cured, Everbuild silicone sealant is waterproof, making it ideal for use as a gasket sealant.
TEMPERATURE RESISTANCE – Heat stable up for short-term use at 275°C and continuous use at temperatures of 250°C.
EASY TO APPLY – Insert the cartridge into a standard sealant gun, snip the tip and apply.

BLACK HIGH TEMPERATURE HT SILICONE ADHESIVE SEALANT 70ml HEAT RESISTANT 300'C

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Why We Love It

Versatile bonding on various surfaces.
Resilient in extreme temperatures.
Resistant to various elements.

Main Highlights

HIGH QUALITY BLACK SEALANT 300ºC HEAT RESISTANT HERMETIC
Creates 100% rubber which leaves flexible at temperatures - 60ºC up to up to + 300ºC
Perfectly bonds to all smooth metal surfaces, alloys and casts glass, ceramics, plastic, wood,
mineral products, marble, stone,concrete etc. Replaces different kind of gaskets resistant to
UV radiation, changing weather conditions, oils, cooling liquids, petrol, and water.

Visbella 150g Auto Vehicle Exhaust System Sealant, Non-Slumping Professional Repair Crack Adhesive Sealer for Car Mufflers, Tailpipes, Catalytic Converters

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Why We Love It

Perfect seal against harmful fumes.
Withstands high temperatures easily.
Environmentally friendly and effective.

Main Highlights

Perfect sealing against harmful vapours: Visbella Exhaust Cement is a waterproof, thick, non-collapsing paste-like repair material. It hardens when heated and provides a perfect seal against all harmful fumes
High temperature up to 1100°C: Visbella exhaust cement hardens in heat and can withstand temperatures up to 1100°C. It hardens by evaporation of water and continues to harden when additional heat is supplied
Multiple applications: Specially formulated for mounting all joints of the exhaust system, including silencers, tailpipes, catalytic converters and more. It is also useful for similar applications that need to withstand strong heat up to 1100°C
Easy to repair and cost-efficient: easy to use, long maintenance time. No prior knowledge required. No special skills are required. Store in a cool, dry place. Store at a temperature below 25°C
Environmentally friendly: repair the exhaust pipe to avoid air pollution and noise pollution, extend the life of the car and pass the annual vehicle inspection

BLACK HIGH TEMPERATURE SILICONE ADHESIVE SEALANT 20ml HEAT RESISTANT 300'C new

7% OffFree Shipping

Why We Love It

Versatile and strong bonding ability.
Withstands extremely high temperatures.
Resistant to various conditions.

Main Highlights

HIGH QUALITY BLACK SEALANT 300ºC HEAT RESISTANT
Creates 100% rubber which leaves flexible at temperatures - 60ºC up to up to + 300ºC
Perfectly bonds to all smooth metal surfaces, alloys and casts glass, ceramics, plastic, wood,
mineral products, marble, stone,concrete etc. Replaces different kind of gaskets resistant to
UV radiation, changing weather conditions, oils, cooling liquids, petrol, and water.

flintronic RTV Engine Sealant, 650°F High Temperature Silicone Sealant, Oil and Water Resistance Anti-Freeze Sealing for Automotive Motorbike Machine Equipment Repairing, 70ml Silicone Gasket Sealant

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Why We Love It

High strength bonding.
Quick, tough seal.
Versatile and heat-resistant.

Main Highlights

【HIGH QUALITY MATERIAL】Room temperature vulcanized RTV silicone sealant and adhesive, chemically formulated for high strength bonding. Safe, low odor, non-corrosive, excellent adhesion. The paste is red in color and resistant to water, steam, oil, transmission oil and antifreeze, and has a temperature range of -62°C to 343°C
【QUICK SEALING】RTV sealant cures when exposed to moisture in the air, cures in a short time, and the silicone creates a tough, water-resistant seal on most surfaces. It won't shrink, drip, bleed, leak and break, and is sensor safe.
【POWERFUL FUNCTION】Our high-temperature silicone sealant can replace traditional sealing molds such as cork, felt, paper and rubber gaskets, paper seals, and can effectively prevent water, oil, and air leakage. Ensure good sealing and leak-proof effect.
【SUITABLE FOR MOST SURFACES】This silicone gasket sealant is suitable for most metals such as stainless steel, aluminum, brass, and it is also suitable for glass, wooden objects, and other places that need to be sealed. (Note: Surface must be dry and free of dust, dirt, grease and old seal residue.)
【WIDE RANGE OF USES】Great for cars, motorcycles, various metals, oil pans, timing covers, differential covers, driver housings, oil pans, valve covers, thermostat housings, mechanical parts, machines, 3D printers, oven doors, Engines and motors, water pumps, transmissions, high temperature piping systems, carburetors, compressors, timing covers, exhaust manifolds etc.

8.8

Excellent

We scanned 995 products

We reviewed these offers relevant to the High Temp Silicone Exhaust Sealant within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like VOKY, Permatex, Realth, J-B Weld, Everbuild, Technicqll, Visbella, flintronic, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best High Temp Silicone Exhaust Sealant in the market, we considered we took a deep dive into 4976 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Granville 0458 200ml High Temp Instant Gasket Can - Black. We love many things about this product by VOKY. What sets it apart from the competition is Superior, high-quality material, Promises exceptional performance, Enhances everyday experiences.
The best value product for most shoppers and where user satisfaction is continuously the highest is Permatex 81160 High-Temp Red RTV Silicone Gasket: Suitable for Exhaust Manifold, Header, Turbochargers & Slip Fit Exhaust Parts, Temperature Resistant (up to 343°C), Sensor Safe, Non-Corrosive 1 x 85g by Permatex based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for High Temp Silicone Exhaust Sealant and the best cost-to-value ratio is Everbuild EVBPCHEATSIL Heat Resistant Silicone Sealant, Black, 310 mlat Everbuild with a 30% discount.
Our list of the best High Temp Silicone Exhaust Sealant is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best High Temp Silicone Exhaust Sealant in The UK

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We scanned 995 products

We concluded that: