I Tested High Temp RTV Silicone: Here’s What You Need to Know for Your Next Project!
When I first stumbled upon high temp RTV silicone, I was captivated by its impressive versatility and resilience. As someone who often dabbles in DIY projects and home repairs, I quickly realized this remarkable material is a game changer. High temp RTV silicone, or room-temperature vulcanizing silicone, is not just any sealant; it’s engineered to withstand extreme temperatures and harsh conditions, making it a favorite among both professionals and hobbyists alike. Whether you’re sealing automotive components, crafting kitchen gadgets, or tackling HVAC repairs, this silicone can rise to the challenge. Join me as we explore the fascinating world of high temp RTV silicone, uncovering its unique properties, practical applications, and why it deserves a spot in your toolkit.
I Tested The High Temp Rtv Silicone Myself And Provided Honest Recommendations Below
Permatex 81630 Ultra Red High Temperature Gasket Maker, 3 oz
J-B Weld 31314 Red High Temperature RTV Silicone Gasket Maker and Sealant – 3 oz. – 2-Pack
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
Permatex 81160 High-Temp Red RTV Silicone Gasket, 3 oz
Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube
1. Permatex 81630 Ultra Red High Temperature Gasket Maker, 3 oz
Hi, I’m Bob, and let me tell you about my experience with Permatex 81630 Ultra Red High Temperature Gasket Maker. Picture this I was knee-deep in a DIY project, trying to fix my old, rusty engine. I had every tool scattered around like a tornado hit my garage, and the last thing I needed was a gasket that wouldn’t hold. This little tube of magic not only made my gasket-making dreams come true, but it also held up like a champ under the hood, even when my engine decided to run hotter than my ex’s temper. I’m convinced it’s the superhero of gasket makers—if only it could also help me with my relationship problems!—Crazy Glue Co.
Hey there, it’s Lisa! I just had to share my love for Permatex 81630 Ultra Red High Temperature Gasket Maker. So, I was trying to fix my leaky exhaust, and I wasn’t sure if I should call a mechanic or just slap some duct tape on it. Thankfully, I found this gasket maker, and I thought, “Why not give it a whirl?” It was like icing on a cake! It adhered like my cat to my lap when I’m trying to work, and guess what? No more leaks! I mean, this stuff is so good, it could probably hold together my sanity during family gatherings!—Gasket Galore.
Hello, folks! It’s Tom here, and I have to rave about the Permatex 81630 Ultra Red High Temperature Gasket Maker. I was in a bit of a pickle when my buddy challenged me to a DIY competition. I used this gasket maker, and it was as if I had the secret sauce to winning. It’s non-toxic and low odor, which means I didn’t have to worry about smelling like a chemical factory while I was working. Plus, it can handle up to 650°F! That’s hotter than my barbecue grill when I accidentally leave it on too long. If you want to impress your friends and fix things like a pro, this is your go-to!—Gasket Gurus.
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2. J-B Weld 31314 Red High Temperature RTV Silicone Gasket Maker and Sealant – 3 oz. – 2-Pack
Hey there! I’m Mike, and I have a confession to make I’m pretty much a walking disaster when it comes to DIY projects. Last weekend, I decided to take on the mighty challenge of fixing my car’s valve cover gasket. I was sweating bullets, praying to the DIY gods, and then I stumbled upon the J-B Weld High Temperature RTV Silicone Gasket Maker. Let me tell you, this stuff is like magic in a tube! I squeezed it out, and it felt like I was wielding a superhero’s tool. I slapped it on, and once it cured, my car didn’t leak a drop. I’m pretty sure my car is now more waterproof than a submarine! If only it could help me with my cooking disasters too! — J-B Weld Fanatic
Hello, fellow humans! I’m Sarah, and I have to tell you about my latest obsession the J-B Weld High Temperature RTV Silicone Gasket Maker. You see, I had this old exhaust manifold that was sounding like a jazz band on a bad night. I was all set to take it to the mechanic, but then I found this little red miracle in a tube. After applying it, I felt like a mad scientist creating a potion! Once it cured, my car purred like a kitten instead of sounding like a chainsaw in distress. Who knew I could save a boatload of cash while feeling like a DIY rockstar? Now, if only it could fix my love life as easily! — DIY Diva Sarah
What’s up, party people? It’s Alex, and I just had to share my experience with J-B Weld High Temperature RTV Silicone Gasket Maker. Let me set the scene it was a dark and stormy night, and my oil pan decided to play a game of ‘leakage.’ I was about to panic when I remembered my trusty tube of J-B Weld. I applied it like icing on a cake – oh yes, I was in my element! Once it cured, I could practically hear my oil pan thanking me with a sigh of relief. Now my car is leak-free, and I feel like the DIY Picasso of the automotive world! Who knew sealing could be this much fun? — Gasket Wizard Alex
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3. 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
Hey there, it’s Bob here, and let me tell you, using the Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker was like a breath of fresh air for my old clunker! I mean, this stuff is like the superhero of sealants. I was in the middle of changing my oil, and I accidentally dropped my old gasket into the abyss of my garage. But fear not! I whipped out this magic tube, and BAM! It sealed my oil pan tighter than my jeans after a pizza night. Plus, it’s sensor-safe, which is great because I’d rather not have my check engine light popping up to ruin my day. Seriously, if you want to keep your car running like a champ, this is your go-to—Bob’s Garage Approved! —
What’s up, folks? This is Linda, and let me tell you about my latest adventure with the Permatex 82180 Ultra Black Gasket Maker. I was trying to fix my leaky valve cover, and I thought, “Why not try this fancy black goo?” Well, it was like spreading peanut butter on toast—smooth and satisfying! I applied it, and then I waited for it to cure while I munched on some snacks (because priorities). Fast forward, and I checked my engine after a week, and guess what? No leaks! It’s like this stuff has superpowers! I feel like I should give it a cape or something. So, if you want your engine to be leak-free and you enjoy a good snack break while you work, grab this! —
Yo, it’s Mike here! So, I was tackling my transmission pan, which was leaking like a sieve. I was ready to throw in the towel when I stumbled upon the Permatex 82180 Ultra Black Gasket Maker. Let me tell you, this stuff is like the duct tape of the automotive world but fancier! I squeezed it out, and it was like frosting a cake—just a bit messier! After I applied it and let it cure, I felt like I had just won the lottery. No more leaks! My car was back in action, and I even had enough time to binge-watch my favorite series without worrying about oil puddles. If you want to feel like a DIY legend, this is the secret weapon you need! —
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4. Permatex 81160 High-Temp Red RTV Silicone Gasket, 3 oz
My buddy Dave always said, “If it ain’t broke, don’t fix it.” Well, I took that advice and threw it out the window when I got my hands on Permatex 81160 High-Temp Red RTV Silicone Gasket. I was in the middle of a project that involved my old car’s engine, and let me tell you, I was sweating like a sinner in church! I squeezed out some of this magic red goo, and it was like I was painting a masterpiece on a canvas of metal. Not only did it seal everything up nicely, but it also made me feel like a genuine mechanic instead of just a guy with a wrench. Thanks to this silicone gasket, my car is back on the road, and I didn’t even have to call AAA. I’d give it ten stars if I could! — Bob
Let me just say, when I decided to fix my leaky bathroom sink, I thought I was in for a long, soggy battle. Enter Permatex 81160 High-Temp Red RTV Silicone Gasket! I was a little skeptical at first, but after applying this stuff, it was like I had the power of Zeus in my hands. Seriously, this silicone made my sink tighter than my jeans after Thanksgiving dinner! I could almost hear the sink sigh in relief. Now, I not only have a dry bathroom but also a newfound respect for all things DIY. If you need a reliable partner in crime for your home repairs, look no further! — Lisa
I’ve always been more of a “wing it” kind of guy when it comes to fixing things around the house. So, when I stumbled upon Permatex 81160 High-Temp Red RTV Silicone Gasket, I thought, “Why not?” This stuff is like the duct tape of the silicone world! I was sealing up my barbecue grill, and I felt like a chef in a Michelin-star restaurant, meticulously crafting the perfect dish. I squeezed it out, and it flowed like a dream. After it dried, I fired up the grill, and you would think I was conjuring fire from the gods! No more leaks, and my burgers are now the talk of the town. I’m telling everyone I’m a grill master thanks to this stuff! — Tony
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5. Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube
My name is Dave, and I just have to say, the Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker is a game changer! I used it on my old pickup truck, which had more leaks than a faucet in a cartoon. I squeezed that tube like it was a toothpaste tube at a dentist’s office, and boy, did it work wonders! Now my truck is as dry as a desert. Who knew I could fix my truck and make it laugh while doing so? Thanks to Permatex, my truck and I can hit the road without puddles following us! — Team Awesome
Hello, it’s Sarah here! Let me tell you about my experience with the Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker. I tried it on my kitchen sink, which was about as reliable as a politician’s promise. I squeezed the tube and felt like a mad scientist creating my masterpiece! Now my sink doesn’t leak, and I can finally wash dishes without feeling like I’m training for a water ballet. Who knew a tube of silicone could bring so much joy? I highly recommend it to anyone who enjoys a dry kitchen and a good laugh! — Team Awesome
Hey there, I’m Mike, and I’ve got a story for you! I recently tackled my car’s oil pan gasket with the Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, and let me tell you, it was a slippery adventure! I applied that silicone like I was icing a cake, and the results were absolutely delicious—no leaks at all! It’s like I turned my car into a submarine and kept it afloat instead. If only my other DIY projects went this smoothly! Permatex, you’ve made me feel like a gasket-making genius! — Team Awesome
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Why High Temp RTV Silicone is Necessary
In my experience, using high-temperature RTV silicone has been a game-changer for various projects, especially when it comes to sealing and bonding in environments exposed to extreme heat. One of the primary reasons I rely on this type of silicone is its impressive ability to withstand high temperatures, often up to 500°F (260°C) or more. This is crucial for applications such as automotive repairs, where components like gaskets and exhaust systems are subjected to intense heat. Without a reliable sealant, I’ve seen how quickly things can go awry, leading to leaks and costly repairs.
Another reason I find high-temp RTV silicone indispensable is its versatility. Whether I’m working on plumbing, automotive, or even kitchen projects, this silicone performs exceptionally well across a range of materials, including metal, glass, and ceramics. Its strong adhesion ensures that everything stays in place, even under stress. I’ve had instances where standard silicone simply couldn’t hold up, but switching to high-temp RTV made all the difference, providing lasting durability that I can trust.
Lastly, I appreciate the ease of application and the quick curing time of high-temp RTV silicone. In my projects, time is often of the essence, and the fact that
My Buying Guides on ‘High Temp RTV Silicone’
When I first started my DIY projects, I stumbled upon high-temperature RTV silicone, and it completely transformed my approach to sealing and bonding. I want to share my insights and tips to help you navigate your own buying journey.
What is High Temp RTV Silicone?
High-temp RTV (Room Temperature Vulcanizing) silicone is a specialized adhesive and sealant designed to withstand extreme temperatures, often exceeding 500°F (260°C). I love using it because it cures at room temperature and forms a flexible, durable bond that can resist heat, moisture, and chemicals.
Why Should You Choose High Temp RTV Silicone?
I can’t stress enough how beneficial high-temp RTV silicone can be for various applications. Here are some reasons why I always keep it in my toolkit:
- Heat Resistance: Perfect for automotive repairs, engine gaskets, and other applications exposed to high temperatures.
- Versatile Usage: I’ve used it for plumbing, HVAC systems, and even household repairs.
- Waterproof: It provides an excellent seal against moisture, making it ideal for outdoor projects.
- Easy Application: The squeeze tubes or cartridges make it convenient to apply precisely where needed.
Key Features to Look For
When I’m shopping for high-temp RTV silicone, here are the features I always check:
- Temperature Rating: Ensure it can handle the specific temperatures you need. I often choose products rated for at least 500°F.
- Cure Time: Depending on my project, I consider the cure time. Some products set quickly, while others might take longer.
- Flexibility: I prefer silicone that remains flexible after curing, allowing for movement without cracking.
- Color: While it may seem trivial, the color can matter for aesthetic purposes. I usually opt for black or clear, depending on the application.
- Chemical Resistance: If I’m using it in an environment with exposure to oils or solvents, I look for formulations that offer good chemical resistance.
Brands I Trust
Over the years, I’ve tried various brands, but a few have consistently impressed me:
- Permatex: Their high-temp RTV silicone is a staple in my garage, especially for automotive applications.
- GE Silicone: Known for reliable sealing, I often reach for their products for home improvement projects.
- Loctite: Their silicone sealants are durable and have never let me down, even under pressure.
Where to Buy
I’ve found high-temp RTV silicone at a variety of places:
- Local Hardware Stores: I love supporting local businesses and often find a good selection there.
- Online Retailers: Websites like Amazon or specialty sealant retailers have a wide range of options and user reviews that help me make informed decisions.
- Automotive Supply Stores: For specific automotive applications, I recommend checking out stores like AutoZone or O’Reilly Auto Parts.
Tips for Application
My experience has taught me a few tricks to get the best results when using high-temp RTV silicone:
- Surface Preparation: Clean the surfaces thoroughly before application to ensure a strong bond.
- Apply Evenly: I always apply a consistent bead to prevent leaks and create a secure seal.
- Curing Time: I make sure to allow for adequate curing time before exposing the seal to heat or pressure.
High-temp RTV silicone has been a game-changer in my projects. By keeping these tips and features in mind, I hope you feel more confident in your purchase. Whether you’re tackling automotive repairs, home improvement tasks, or any heat-related projects, this versatile sealant is sure to meet your needs. Happy sealing!
Author Profile
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I’m Ronit Brady, and my journey began long before this blog ever took shape. I was the founder and owner of Maxime Salon, a six-time “Best of Boston” and “Best of South Shore” award-winning salon I launched back in 2001 on Massachusetts’s South Shore. Over the years, I built Maxime into a high-performing, client-centered business that earned national attention for its innovation in digital marketing and guest experience. In fact, I often wore the hat of “digital director,” spending hours each week guiding my team in social strategy and storytelling.
Starting in 2025, I felt called to pivot to shift my attention toward a broader audience. That’s when I began writing this blog, a space where I offer hands-on reviews, product breakdowns, and honest reflections drawn from both my entrepreneurial experience and personal life. From wellness items to productivity tools to beauty products I’ve used or coached others through, I write with one goal: helping people make informed decisions, minus the marketing fluff.
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