10 Best Head Gasket Sealers 2025 in the United States

The Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker is a solid choice for anyone looking to create or replace gaskets in various automotive applications. Its non-corrosive formula is sensor-safe and offers superior adhesion, making it particularly effective on oily surfaces. This feature is a big plus, especially for users working on tasks involving engine oil or transmission fluid, as it ensures a durable and long-lasting seal. The gasket maker operates effectively within a broad temperature range of -65°F to 500°F, which enhances its versatility in different automotive environments.

With a full cure time of 24 hours, it’s essential to plan your repairs accordingly since you'll need to allow adequate time for the product to set properly. For ease of application, the silicone is user-friendly, allowing both DIY enthusiasts and professional mechanics to work with it without too much hassle.

While it boasts high flexibility and resistance to aging, the 24-hour curing time may be lengthy for those in a hurry to finish repairs. Additionally, the product comes in a small volume (3.35 fluid ounces), which might not be sufficient for larger jobs, necessitating the purchase of multiple tubes for extensive applications.

The Permatex 80697 Copper Spray-A-Gasket Hi-Temp Adhesive Sealant is a reliable choice for those needing a high-temperature adhesive solution. Its compatibility with cylinder head gaskets, exhaust manifold gaskets, and other high-temperature applications is a significant advantage. The product performs well in extreme temperatures, with a tolerance range of -50°F to 500°F (-45°C to 260°C), making it suitable for various automotive repairs.

The fast-drying formula is convenient, allowing for quicker completion of tasks. Additionally, its ability to fill minor surface imperfections enhances its sealing effectiveness and prevents gasket burnout by dissipating heat effectively. The copper material further aids in heat transfer and durability. Application is straightforward due to its spray form, which ensures even coverage and ease of use.

Weighing 12 ounces and with compact dimensions, it is easy to store and handle. Despite minor drawbacks, such as potentially needing trial for curing time, the Permatex 80697 remains a versatile and effective option for high-temperature sealing needs.

The Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant is a versatile product suitable for both aviation and automotive applications. One of its major strengths is its wide temperature tolerance, ranging from -65F to 400F, making it effective under various conditions. Its slow-drying and non-hardening properties ensure flexibility, which is beneficial for close-fitting machined surfaces and solid gaskets.

Additionally, its resistance to gasoline, oil, and grease adds to its durability and reliability, particularly in demanding environments. The 4 oz. container with a brush-top makes application relatively straightforward, although some users might find the slow-drying nature a minor inconvenience if quick fixes are needed.

While the product is designed to be effective for sealing hoses and machined surfaces, it may not be suitable for larger repairs due to its small size. Also, being a non-hardening sealant, it might not offer the same level of permanence as hardening alternatives. However, for those needing a robust and flexible sealant for specific applications in both aviation and automotive settings, the Permatex 80019 proves to be a reliable choice.