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Updated
Pros
  • Excellent oil resistance
  • Durable and flexible
  • Resistant to automotive fluids
  • Instant sealing
  • High temperature resistance
  • Durable seal
Cons
  • Long curing time
  • Higher cost
Bottom Line
Permatex Ultra Black is a premium gasket maker ideal for high-flex applications and heavy-duty automotive tasks. Its oil resistance makes it perfect for valve covers, oil pans, and timing covers. It ensures a reliable seal even under extreme conditions.
Permatex Right Stuff is an instant gasket maker that seals instantly for leak-proof gaskets. It is ideal for applications that require immediate service.
Type
RTV Silicone
Instant Gasket
Temperature Range
-65°F to 500°F
-75°F to 450°F
Volume
3.35 oz
5 oz
Height
8 inches
9.13 inches
Length
1.38 inches
1.94 inches
Weight
0.000625 pounds
1 pounds
Width
3.81 inches
1.94 inches
Part Number
82180
33694
Model
82180
33694

When it comes to gasket sealants, two popular products from Permatex are often considered by mechanics and DIY enthusiasts: Permatex Ultra Black and Permatex Right Stuff. Both products are designed to provide a reliable seal in various applications, but they have distinct differences in terms of their formulation, properties, and uses.

Permatex Ultra Black

Permatex Ultra Black is a high-performance gasket sealant that is specifically designed for use in extreme temperature and pressure environments. It is a polyacrylate-based formula that provides a flexible, yet durable seal that can withstand temperatures ranging from -65°F to 500°F (-54°C to 260°C). This makes it an ideal choice for applications such as engine gaskets, transmission pan gaskets, and other high-temperature areas.

One of the key benefits of Permatex Ultra Black is its ability to resist degradation from oil, fuel, and other chemicals. It also has a fast-drying formula that allows for quick assembly and minimal downtime. Additionally, it is sensor-safe and will not contaminate oxygen sensors or other sensitive components.

Permatex Right Stuff

Permatex Right Stuff, on the other hand, is a general-purpose gasket sealant that is designed for use in a wide range of applications. It is a non-drying, non-hardening formula that provides a flexible seal that can absorb vibrations and movement. This makes it an ideal choice for applications such as valve cover gaskets, intake manifold gaskets, and other areas where flexibility is important.

One of the key benefits of Permatex Right Stuff is its ease of use. It is a simple, mess-free formula that can be applied directly to the gasket or surface. It also has a low odor and is non-toxic, making it a great choice for use in confined spaces or areas with limited ventilation.

Comparison

When comparing Permatex Ultra Black and Permatex Right Stuff, there are several key differences to consider:

  • Temperature range: Permatex Ultra Black has a much higher temperature range than Permatex Right Stuff, making it more suitable for high-temperature applications.
  • Formulation: Permatex Ultra Black is a polyacrylate-based formula, while Permatex Right Stuff is a non-drying, non-hardening formula.
  • Flexibility: Permatex Right Stuff is more flexible than Permatex Ultra Black, making it better suited for applications where movement and vibration are present.
  • Chemical resistance: Permatex Ultra Black has better chemical resistance than Permatex Right Stuff, making it more suitable for use in areas where oil, fuel, or other chemicals may be present.

Conclusion

In conclusion, both Permatex Ultra Black and Permatex Right Stuff are high-quality gasket sealants that can provide a reliable seal in various applications. However, the choice between the two ultimately depends on the specific needs of the job. If you need a high-performance sealant for extreme temperature and pressure environments, Permatex Ultra Black may be the better choice. On the other hand, if you need a general-purpose gasket sealant that is easy to use and provides a flexible seal, Permatex Right Stuff may be the way to go. As with any gasket sealants, it's essential to follow the manufacturer's instructions and take necessary precautions to ensure a safe and successful application.