10 Best Exhaust Sealants 2025 in the United States

The Permatex 27036 Optimum Grey Gasket Maker excels in areas vital for an exhaust sealant. Its standout feature is its impressive temperature resistance, withstanding from -65F to 700F, which is essential for high-temperature environments often encountered in automotive applications. This product also boasts excellent flexibility, being 15% more elastic than the Ultra Grey variant, which helps in maintaining a durable seal even under conditions of high vibration, a common occurrence in exhaust systems.

Additionally, the Permatex 27036 offers significant resistance to oils, coolant, and other shop fluids, ensuring that the seal remains intact despite exposure to harsh chemicals, which is a critical aspect for durability and performance. The sensor-safe and non-corrosive qualities make it suitable for modern vehicular systems without causing damage or interference with sensors. Moreover, ease of application is enhanced with the inclusion of two nozzles, allowing for more precise and user-friendly application.

On the downside, users might find the curing time to be less rapid compared to some other products, which can be a minor inconvenience if quick fixes are needed. Also, while the product is highly flexible, it might not be as rigid as some high-strength alternatives available. Despite these minor drawbacks, the Permatex 27036 Optimum Grey Gasket Maker is a robust choice for anyone needing a reliable and high-performing exhaust sealant, particularly in demanding automotive settings.

The Permatex 27038 Optimum Red High Temperature Gasket Maker is a reliable choice for those needing a robust sealant for high-temperature applications. One of its key strengths is its impressive temperature resistance, with the ability to withstand up to 750°F (399°C) intermittently. This makes it suitable for demanding applications like headers, manifolds, and turbochargers.

The product is designed to be sensor-safe, non-corrosive, and low odor, which adds to its user-friendliness. Additionally, its non-flammable and non-toxic properties enhance its safety profile during use. The versatility of this gasket maker is notable as it can be used both as a gasket maker and dressing, meeting the performance specifications of original equipment (OE) silicone gaskets.

The silicone material provides a robust and long-lasting seal. The ease of application appears to be good, but the small tube size (3 oz) might not be sufficient for larger projects. The Permatex 27038 is an excellent choice for those needing a reliable, high-temperature sealant for automotive applications, but users should consider their project size and timing needs.

Permatex 59214 High Temperature Thread Sealant is designed to lock and seal threaded fittings, making it a versatile choice for various automotive and mechanical applications. This sealant offers excellent temperature resistance, crucial for high-heat environments like exhaust systems. Its ability to resist leakage, vibration loosening, and exposure to moisture, hydraulic fluids, and diesel fuels adds to its versatility and reliability in challenging conditions.

The product's flexibility allows parts to be repositioned up to 4 hours after application, which can be helpful during adjustments or repairs. Additionally, it lubricates threads, making assembly and disassembly straightforward. However, the curing time and flexibility might be a concern for users needing an immediate fix. While it is suitable for metals and various plastics or composite materials,

The ease of application is a significant advantage, as it simplifies the sealing process even for those with minimal experience. In conclusion, Permatex 59214 is a reliable and user-friendly sealant ideal for those needing a durable and flexible solution for their automotive or mechanical threading needs.