--- product_id: 508818047 title: "Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF" brand: "plextone" price: "$21.64" currency: USD in_stock: true reviews_count: 13 category: "Plextone" url: https://www.desertcart.us/products/508818047-black-rtv-silicone-engine-repair-gasket-seal-maker-sealant-glue store_origin: US region: United States of America --- # Heat resistant up to 650ºF Operates from -80ºF cold temps 100% silicone for durable sealing Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF **Brand:** plextone **Price:** $21.64 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal the deal with confidence—engineered to endure, designed to impress! ## Quick Answers - **What is this?** Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF by plextone - **How much does it cost?** $21.64 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/508818047-black-rtv-silicone-engine-repair-gasket-seal-maker-sealant-glue) ## Best For - plextone enthusiasts ## Why This Product - Trusted plextone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Fast Tack & Cure Time:** Becomes tack-free in 15-20 minutes and fully cures in 24 hours, minimizing downtime. - • **Long-Lasting, Flexible Seal:** 100% silicone formula resists thermal cycling and migration, ensuring a reliable gasket every time. - • **Extreme Temperature Resilience:** Seals tight from freezing cold to blazing heat, perfect for any engine challenge. - • **Reusable Nozzle & Easy Cleanup:** Designed for multiple uses with simple cleaning, so you’re always ready for the next repair. - • **Versatile Engine Compatibility:** Ideal for cylinder blocks, valve covers, oil pans, and more—engineered for all your automotive needs. ## Overview Plextone Black RTV Silicone Engine Repair Gasket Seal Maker is a high-performance, 100% silicone sealant engineered to withstand extreme temperatures from -80ºF to 650ºF. It cures quickly to form a durable, flexible gasket ideal for automotive engine parts like valve covers, oil pans, and transmissions. Its fast tack time and thermal resistance make it a must-have for professional-grade repairs and maintenance. ## Description Product Description Plextone HI-TEMP BLACK RTV DIRECTIONS 1. Clean and dry all surfaces. 2. Cut nozzles to desired bead size, apply a continuous and even bead of silicone to one surface, surrounding all bolts holes. Remove excess at once. 3. Assemble parts immediately. Do not squeeze out silicone by over tightening bolts. Re-torque will not be necessary. 4. Silicone "skins" and becomes tack free in 15-20 minutes, dries in 1 hour and fully cures in 24 hours at 21°C(70°F)-50% relative humidity. Allow more time in cold weather. 5. Replace cap after use. Clean hands with dry cloth or Hand Cleaner. Clean tools with non-flammable cleaning fluid. GASKET MAKER RTV 100% SILICONE a. AUTOMOBILE CYLINDER BLOCK b. GEARBOX c. ENGINE PARTS d. TRANSMISSION It forms anysize of shap a gasket which is resistant to both temperature and migrating caused by thermal cycling. Withstands temperature from -80°F up to 650°F(343°C). Idealotimeing covers, valve covers, oil pans, intake manifolds, exhaust manifalds and water pumps. Dries securieiy as gasket. Review: For my lawnmower - Excellent product and service works well Review: Good Value - Used to seal valve cover on Honda Izzy Lawn Mower - Good value at £6.99 on desertcart with lots of good reviews. The Plextone sealant had a good amount of "grab" when I placed the valve cover onto the vertical face of the lawn mower engine and held in place with my hand until secured with the bolts. Only needed a small amount for the valve cover seal, so after use, removed the nozzle provided and replaced with the original cap, should I need the product at a later date for another task. Cleaned sealant from the nozzle supplied, with the aid of blue workshop paper, isopropyl alcohol and the shaft of an old small paint touch up brush to work the sealant out of the nozzle, so that the nozzle is available for use if required. ## Features - Contains vinyl oximino silane. May produce an allergic reaction. - Safety data sheet available on request. ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | Plextone | | Manufacturer | Plextone | | Material | Silicone | | Shape | Round | | UPC | 711866781650 | ## Product Details - **Brand:** Plextone - **Manufacturer:** Plextone - **Material:** Silicone - **Shape:** Round - **UPC:** 711866781650 ## Images ![Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF - Image 1](https://m.media-amazon.com/images/I/719OK65s3ML.jpg) ![Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF - Image 2](https://m.media-amazon.com/images/I/61XH8a+OwvL.jpg) ![Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF - Image 3](https://m.media-amazon.com/images/I/71JV6FadJbL.jpg) ![Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF - Image 4](https://m.media-amazon.com/images/I/71M5uBZ6lhL.jpg) ![Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF - Image 5](https://m.media-amazon.com/images/I/51M04SZ1WIL.jpg) ## Questions & Answers **Q: Is this okay to use on engine block and head ?** A: No it is a silicon based sealant great for water pump/inlet manifold/rocker cover/ etc but not any parts continuously immersed in petrol or cylinder heads. (On many modern engines the cylinder head gasket is a "compound" gasket using several different materials, it is a precision part and no one "cure all" will be adaquate) ## Customer Reviews ### ⭐⭐⭐⭐⭐ For my lawnmower *by A***R on 22 March 2026* Excellent product and service works well ### ⭐⭐⭐⭐⭐ Good Value - Used to seal valve cover on Honda Izzy Lawn Mower *by M***T on 15 October 2025* Good value at £6.99 on Amazon with lots of good reviews. The Plextone sealant had a good amount of "grab" when I placed the valve cover onto the vertical face of the lawn mower engine and held in place with my hand until secured with the bolts. Only needed a small amount for the valve cover seal, so after use, removed the nozzle provided and replaced with the original cap, should I need the product at a later date for another task. Cleaned sealant from the nozzle supplied, with the aid of blue workshop paper, isopropyl alcohol and the shaft of an old small paint touch up brush to work the sealant out of the nozzle, so that the nozzle is available for use if required. ### ⭐⭐⭐⭐⭐ Good quality *by R***. on 17 March 2026* Good quality,ideal for replacing sump on car ## Frequently Bought Together - Plextone Black RTV Silicone Engine Repair Gasket Seal Maker, Sealant Glue, High Temperature Heat Resistant from -80ºF to 600ºF - Loctite Threadlocker, Locks & Seals All Metal Nuts, Balls & Screws, Prevents Leakage & Corrosion, 1 x 5g --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/508818047-black-rtv-silicone-engine-repair-gasket-seal-maker-sealant-glue](https://www.desertcart.us/products/508818047-black-rtv-silicone-engine-repair-gasket-seal-maker-sealant-glue) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-07*