Looking for the best automotive sealants?
We’ve rounded up the top 10 options, packed with real user stories of fixing leaks and enjoying durable bonds through all kinds of driving conditions.
Automotive sealants keep engines running smoothly. They stop leaks and hold things tight.
People love sharing how these products saved their cars from big fixes. One driver fixed a oil leak with Permatex Ultra Black and drove without issues for years. Another user sealed a valve cover and felt the bond last through tough weather.
Trust our guide to pick the right sealant for your needs. It covers top picks with clear tips to make it easy.
List of Top 10 Automotive Sealants
| Image | Title | Best For | Price |
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Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 3 oz |
This gasket maker is perfect for DIYers and professional mechanics who work on engines and oil systems. It features a non-corrosive, sensor-safe formula with high flex and oil resistance, ideal for sealing valve covers, oil pans, and other oil-heavy seals. |
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Permatex 81158 Black Silicone Adhesive Sealant, 3 oz. Tube, Pack of 1 |
This black silicone adhesive sealant is perfect for DIY homeowners, auto enthusiasts, and professional repair workers who need a strong, waterproof seal for doors, roofs, and electrical connections. It handily fixes cars, homes, and outdoor gear with one easy-to-use tube. |
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Permatex 82194 Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Torque And Vibration Resistant Applications, 3 oz |
This product is perfect for auto mechanics and DIY car enthusiasts who need a strong, reliable seal for parts that face high torque and lots of vibrations. It’s ideal for anyone working on engines, transmissions, or other vehicle components where a lasting gasket is key. |
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Permatex 80050 Clear RTV Silicone Adhesive Sealant, 3 oz |
This sealant is perfect for DIY mechanics who need to seal and repair cars, trucks, or other vehicles. It’s also great for homeowners fixing leaks in door frames, roofs, or windshields around the house. |
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![[Black] Professional Automotive Seam Sealer, Paintable Quick-Set Polyurethane Auto Body Seam Sealer for Metal Surfaces of Cars, Trucks, Etc, Includes Gloves & Tip - Black RV Roof Sealant](https://m.media-amazon.com/images/I/41fApnuHD4L._SL500_.jpg) |
[Black] Professional Automotive Seam Sealer, Paintable Quick-Set Polyurethane Auto Body Seam Sealer for Metal Surfaces of Cars, Trucks, Etc, Includes Gloves & Tip – Black RV Roof Sealant |
This seal sealer is perfect for DIY car and truck repairs, RV roof work, and boat projects. It’s easy to use, paintable in 30 minutes, and trusted by auto pros who want a fast, durable seal. |
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Dap 00694 2.8-Ounce Silicone Rubber Auto/Marine Sealant, Clear |
This silicone sealant is perfect for car owners fixing windshields, headlights, or adding trim. It also suits boat owners sealing hatches, cleats, or accessories on their vessels. |
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J-B Weld 31319 Black RTV Silicone Sealant and Adhesive – 3 oz. |
This RTV Silicone sealant & adhesive is for DIYers and pros who seal uneven surfaces. It cures at room temperature and sticks well. |
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Permatex 81630 Ultra Red High Temperature Gasket Maker, 3 oz |
Got a car? This is for you! The Permatex Ultra Red Gasket Maker is perfect for anyone needing a high-temp sealant that’s easy to use and long-lasting. |
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Permatex 82180 Ultra Black RTV Silicone Gasket Maker |
This Permatex 82180 Ultra Black RTV Silicone Gasket Maker is perfect for mechanics, car hobbyists, and anyone fixing engines at home or in a shop. It offers strong hold with high flexibility and oil resistance, making it ideal for reliable repairs that meet OEM standards. |
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Permatex 59214 High Temperature Thread Sealant, 6 ml Tube, Pack of 1 |
This sealant is perfect for anyone who works with threaded fittings on engines and lines. It locks and seals, resists leaks and loosening, lubricates threads for easy assembly, and lets you reposition parts for up to 4 hours. |
Detailed Reviews
Find the best automotive sealants with this guide, created with expert insights. Each product is carefully reviewed to ensure you choose the perfect sealant for your needs. This guide will help you find the ideal sealant to keep your vehicle running smoothly.
1. Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 3 oz
Tired of leaks? Permatex 82180 Ultra Black is the answer. It’s a sensor-safe and non-corrosive gasket maker.
This silicone gasket maker is very tough. It resists oil and extreme temperatures. You can use it in many places.
Use it on valve covers, oil pans, and more. It creates a strong and lasting seal.
| Pros | Cons |
|---|---|
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Perfect For:
This gasket maker is perfect for DIYers and professional mechanics who work on engines and oil systems. It features a non-corrosive, sensor-safe formula with high flex and oil resistance, ideal for sealing valve covers, oil pans, and other oil-heavy seals.
Ready to Purchase?
2. Permatex 81158 Black Silicone Adhesive Sealant, 3 oz. Tube, Pack of 1
Permatex 81158 is a black silicone adhesive sealant in a 3 oz tube. This professional formula works as a sensor-safe and general-purpose RTV sealant. You can use it inside or outside for many jobs.
It helps seal, bond, repair, mend, and secure items like glass, metal, plastics, and vinyl. The sealant stays waterproof and flexible to fight water, weather, and vibration.
This multipurpose formula handles extreme temperatures from -75°F to 450°F. Apply it to door frames, electrical connections, seams, roofs, weather stripping, and housings. It protects and repairs wires but is not for engine gaskets.
| Pros | Cons |
|---|---|
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Perfect For:
This black silicone adhesive sealant is perfect for DIY homeowners, auto enthusiasts, and professional repair workers who need a strong, waterproof seal for doors, roofs, and electrical connections. It handily fixes cars, homes, and outdoor gear with one easy-to-use tube.
Ready to Purchase?
3. Permatex 82194 Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Torque And Vibration Resistant Applications, 3 oz
Unleash the power of Permatex Ultra Grey! It’s the ultimate gasket maker.
This product is sensor-safe and non-corrosive. It offers maximum vibration resistance. It creates a tough, flexible gasket.
Use it for valve covers and water pumps. It also works on oil pans. Keep your machines running smoothly!
| Pros | Cons |
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Perfect For:
This product is perfect for auto mechanics and DIY car enthusiasts who need a strong, reliable seal for parts that face high torque and lots of vibrations. It’s ideal for anyone working on engines, transmissions, or other vehicle components where a lasting gasket is key.
Ready to Purchase?
4. Permatex 80050 Clear RTV Silicone Adhesive Sealant, 3 oz
The Permatex 80050 Clear RTV Silicone Adhesive Sealant is a professional-grade sealant perfect for all your indoor and outdoor projects. It is sensor-safe and versatile, ideal for sealing, bonding, and repairing a wide range of materials like glass, metal, plastics, and fabric. This clear sealant resists water, weather, and vibrations, making it reliable in tough conditions.
It can handle temperatures from -75°F to 400°F (-59°C to 204°C). Use it on door frames, seams, roofs, or vinyl tops. It works well on windshields and electrical wiring. Remember, it’s not recommended for engine gaskets.
Just apply and enjoy a secure, long-lasting fix every time.
| Pros | Cons |
|---|---|
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Perfect For:
This sealant is perfect for DIY mechanics who need to seal and repair cars, trucks, or other vehicles. It’s also great for homeowners fixing leaks in door frames, roofs, or windshields around the house.
Ready to Purchase?
5. [Black] Professional Automotive Seam Sealer, Paintable Quick-Set Polyurethane Auto Body Seam Sealer for Metal Surfaces of Cars, Trucks, Etc, Includes Gloves & Tip – Black RV Roof Sealant
This automotive seam sealer bonds strongly to metal surfaces on cars, trucks, and RVs. It sets quickly and lets you paint right away without sanding.
Our sealer stays flexible through hot and cold weather without crackling. It works great inside or outside. Use it on boats too for a solid fit.
Experts trust this sealer for top-quality repairs every time. Your projects will look professional and last long with our guarantee.
| Pros | Cons |
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Perfect For:
This seal sealer is perfect for DIY car and truck repairs, RV roof work, and boat projects. It’s easy to use, paintable in 30 minutes, and trusted by auto pros who want a fast, durable seal.
Ready to Purchase?
6. Dap 00694 2.8-Ounce Silicone Rubber Auto/Marine Sealant, Clear
Introducing the Dap 00694 2.8-Ounce Silicone Rubber Auto/Marine Sealant, a clear sealant that keeps things secure and dry. This 100% silicone product forms a flexible bond that won’t crack or shrink over time.
It adheres well to glass, metals, and plastics for automotive and marine use. The sealant meets ASTM C920, Class 25 standards for quality. It stays waterproof and weatherproof, even with vibration or changes in size.
Ready for rain in just 12 hours, it’s ideal for windshields, headlights, or trim. Not paintable, so paint first if needed. It lasts for years on both interior and exterior projects.
| Pros | Cons |
|---|---|
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Perfect For:
This silicone sealant is perfect for car owners fixing windshields, headlights, or adding trim. It also suits boat owners sealing hatches, cleats, or accessories on their vessels.
Ready to Purchase?
7. J-B Weld 31319 Black RTV Silicone Sealant and Adhesive – 3 oz.
J-B Weld’s black RTV silicone is a strong sealant and adhesive. It works at room temperature for easy use.
Seal uneven surfaces with ease. Bond parts that do not fit. Fix leaks that keep coming back.
Get this 3 oz. tube today. It keeps things air tight for a long time.
| Pros | Cons |
|---|---|
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Perfect For:
This RTV Silicone sealant & adhesive is for DIYers and pros who seal uneven surfaces. It cures at room temperature and sticks well.
Ready to Purchase?
8. Permatex 81630 Ultra Red High Temperature Gasket Maker, 3 oz
Need a reliable sealant? The Permatex Ultra Red Gasket Maker is your answer. It handles extreme heat. It will keep everything tight.
This product is sensor-safe. There is also low odor.
It works as a gasket maker. It also works as a dressing. Get yours now.
| Pros | Cons |
|---|---|
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Perfect For:
Got a car? This is for you! The Permatex Ultra Red Gasket Maker is perfect for anyone needing a high-temp sealant that’s easy to use and long-lasting.
Ready to Purchase?
9. Permatex 82180 Ultra Black RTV Silicone Gasket Maker
Stop leaks now! Permatex Ultra Black seals tight. It is easy to use. Get the job done right!
This gasket maker is super strong. It resists oil and fluids. It is safe for sensors.
OEM approved. Buy Permatex now!
| Pros | Cons |
|---|---|
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Perfect For:
This Permatex 82180 Ultra Black RTV Silicone Gasket Maker is perfect for mechanics, car hobbyists, and anyone fixing engines at home or in a shop. It offers strong hold with high flexibility and oil resistance, making it ideal for reliable repairs that meet OEM standards.
Ready to Purchase?
10. Permatex 59214 High Temperature Thread Sealant, 6 ml Tube, Pack of 1
Stop leaks now with Permatex High Temperature Thread Sealant! It locks and seals things tight.
This sealant can handle high heat. It is strong against fuel, oil, and more.
Use it on bolts or lines. Put it on sensors or plugs. Get Permatex today!
| Pros | Cons |
|---|---|
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Perfect For:
This sealant is perfect for anyone who works with threaded fittings on engines and lines. It locks and seals, resists leaks and loosening, lubricates threads for easy assembly, and lets you reposition parts for up to 4 hours.
Ready to Purchase?
Buying Guide
Automotive sealants keep engines running smooth. They stop leaks and hold parts tight. People love sharing stories of how these products saved their cars from big fixes.
One driver fixed a oil leak with Permatex Ultra Black and drove without issues for years. Another user sealed a valve cover and felt the bond last through tough weather. These real stories show how sealants build trust for everyday drivers.
Here are key factors to consider when buying automotive sealants:
– Type of Sealant: Pick a type that fits your job, like RTV silicone for gaskets or polyurethane for seams. Check if it is sensor-safe to avoid damaging electronics. Make sure it bonds well to materials like metal or glass.
– Temperature Resistance: Choose one that handles extreme heat or cold for your needs. Most sealants work from -75°F to 450°F, but check the range. This keeps the seal strong in hot engines or cold weather.
– Oil and Fluid Resistance: Look for ones that resist oil, fuel, and other fluids inside engines. Products like Ultra Black work great for oil pans. This prevents leaks from ruining your ride.
– Flexibility and Durability: Get a sealant that stays flexible to fight vibration and movement. It should be waterproof and weatherproof for outdoor use. A tough one lasts longer and cuts down on repairs.
– Color and Application: Black sealants blend well on engines, while clear ones work for trim. Consider if it is paintable for body work. Think about size, like a 3 oz tube for small jobs.
– Intended Use: Use engine-specific ones for gaskets, not general sealants. Avoid non-gasket formulas on oil parts. Follow tips to apply right for best results.
– Safety Features: Opt for non-corrosive and low-odor options to protect parts. Sensor-safe ones are key for modern cars. This keeps repairs safe and easy.