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5 Best Gasket Sealants

Updated
By
An expert product reviewer with over a decade of experience reviewing the latest appliances and technology.
Updated

Main Features

  • High oil resistance
  • Superior flexibility
  • Heavy-duty applications
  • Excellent compressibility

Product Overview

Permatex Ultra Black is a high-performance RTV silicone gasket maker designed for high-flex and heavy-duty applications. Its advanced formulation provides excellent oil resistance, making it ideal for use on valve covers, oil pans, and timing covers.

The sealant's superior flexibility and compressibility ensure a reliable and durable seal, even in extreme conditions. Permatex Ultra Black is also resistant to common automotive fluids, enhancing its suitability for automotive maintenance and repair tasks.

PROS
  • Excellent oil resistance
  • Durable and flexible
  • Resistant to automotive fluids
CONS
  • Long curing time

Product Specifications

  • Type RTV Silicone
  • Temperature Range -65°F to 500°F
  • Volume 3.35 oz

Main Features

  • High adhesion
  • Flexible seal
  • Fast curing
  • Temperature resistant

Product Overview

3M Ultrapro Black offers excellent adhesion and flexibility, making it a top choice for sealing and bonding automotive parts. This silicone gasket is designed to withstand high temperatures and various automotive fluids, ensuring a reliable seal under demanding conditions.

Its fast curing time and easy-to-use formula make it ideal for both professional mechanics and DIY enthusiasts. Whether you're sealing engine components, transmission pans, or other automotive parts, 3M Ultrapro Black delivers a strong and durable seal.

PROS
  • Strong adhesion
  • Quick curing
  • Temperature resistant
CONS
  • May require primer for some surfaces

Product Specifications

  • Type Silicone
  • Temperature Range -65°F to 500°F
  • Volume 3 oz

Main Features

  • Anaerobic curing
  • Flexible seal
  • Excellent gap filling
  • Oil and water resistant

Product Overview

Loctite 518 Gasket Maker is designed for use on rigid flanges and provides a flexible, yet durable seal. It cures when confined in the absence of air between close-fitting metal surfaces, providing excellent gap filling and sealing capabilities.

This anaerobic gasket maker is ideal for applications that require a reliable seal against oil, water, and other fluids. Loctite 518 is easy to apply and cures quickly, making it a popular choice among professionals and DIY enthusiasts for automotive and machinery repairs.

PROS
  • Flexible and durable
  • Quick curing
  • Resistant to fluids
CONS
  • Limited temperature range

Product Specifications

  • Type Anaerobic
  • Temperature Range -65°F to 300°F
  • Volume 50 ml

Main Features

  • Shellac-based
  • Hard durable seal
  • Resistant to fuels
  • Easy application

Product Overview

Permatex Indian Head is a shellac-based compound that offers a hard and durable seal, making it ideal for sealing threaded connections and machined surfaces. This gasket shellac compound is known for its reliable sealing capabilities and ease of use.

It is resistant to diesel, kerosene, and gasoline, making it suitable for a variety of automotive and industrial applications. Permatex Indian Head is easy to apply and provides a long-lasting seal, ensuring the integrity of your connections and surfaces.

PROS
  • Durable seal
  • Fuel resistant
  • Easy to apply
CONS
  • Not flexible

Product Specifications

  • Type Shellac
  • Temperature Range -65°F to 350°F
  • Volume 2 oz

Main Features

  • Instant gasket
  • Leak-proof seal
  • High temperature resistant
  • Flexible and durable

Product Overview

Permatex Right Stuff is an instant gasket maker that provides leak-proof gaskets instantly, making it ideal for applications that require immediate service. This product creates a durable and flexible seal that can withstand high temperatures and pressures.

It is designed to be used on a variety of surfaces, including metal, plastic, and rubber, making it suitable for a wide range of automotive applications. Permatex Right Stuff is easy to apply and cures quickly, allowing for immediate return to service, which is a significant advantage for time-sensitive repairs.

PROS
  • Instant sealing
  • High temperature resistance
  • Durable seal
CONS
  • Higher cost

Product Specifications

  • Type Instant Gasket
  • Temperature Range -75°F to 450°F
  • Volume 5 oz