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Permatex 27037 Optimum Black Gasket Maker, 3 oz

4.7 4.7 out of 5 stars 17,730 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Gasket Sealers by Permatex

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Pack of 1
3 oz
Optimum Black

Purchase options and add-ons

Brand Permatex
Material Silicone
Color Optimum Black

About this item

  • Sensor-safe, low odor, and non-corrosive
  • Meets performance Specs of OE silicone gaskets. Resistant to Auto & shop fluids and vibration. 15% stronger than Ultra Black.
  • Retains highest flexibility with maximum oil resistance through use of a patented adhesion system. 60% more flexible than Ultra Black
  • Temperature range: -65 DegreeF to 500 DegreeF (-54 DegreeC to 260 DegreeC) intermittent
  • Includes 2 nozzles

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 1.25 x 3.81 x 8 inches; 4 ounces
  • Item model number ‏ : ‎ 27037
  • Date First Available ‏ : ‎ June 9, 2017
  • Manufacturer ‏ : ‎ Permatex
  • ASIN ‏ : ‎ B072MRCG8W
  • Customer Reviews:
    4.7 4.7 out of 5 stars 17,730 ratings

Product Description

Permatex optimum black is designed for gasket making in newer lightweight and premium components where maximum oil resistance is required, specifically within assemblies where two unlike materials meet. Optimum black is ideal for use with valve covers, oil pans, oil pumps, intake manifold end seals, timing gear covers and differential covers.


From the manufacturer

Optimum Black Gasket Maker

Permatex Optimum Black combines maximum oil resistance with maximum flexibility. Today, we see components changing and unlike materials meeting (plastic/steel, aluminum/steel, etc.), all with different rates of expansion and contraction. In addition, with technology advancing, regulations and requirements tightening, we see thinner metals, fewer fasteners, and wider spread bolt patterns. The strength and flexibility of Optimum Black handles the changes and added stresses that exist between today’s lightweight, high performance, and premium component assemblies. Optimum Black is sensor safe, low odor, and non-corrosive with resistance to oil, shop fluids. It is one of the most advanced, maximum flex, maximum oil resistant RTV silicone gasket makers available.

Black RTV Sensor Safe

Black RTV High Flex

Black RTV Oil Resistant

Permatex Optimum Black RTV is a low odor, sensor safe, non-corrosive formula that is resistant to most common shop fluids and meets performance specifications of OE silicone gaskets.

Permatex Optimum Black is designed to be used on areas where you need flexible and oil resistant silicone gaskets. Common Applications include oil pans, timing covers, transmission pans, differential covers.

Permatex Optimum Black is oil resistant and retains high flexibility through the use of a patented adhesion system and eliminates the need for pre-formed, pre -cut gaskets.

Optimum Black Optimum Grey RTV Optimum Red RTV
Optimum Black Optimum Grey Optimum Red
Customer Reviews
4.7 out of 5 stars
17,730
Cure Time 8 Hours 8 Hours 8 Hours
Feature Max Flex and Oil Resistance Max Torque and Vibration Resistance Max Temperature Resistance
Applications Oil pans, timing covers, transmission pans, differential covers Valve covers, water pump, intake manifold end seals, thermostat housings Header, Manifold, Slip-Fit Exhaust Parts, Turbocharge
Ultra Black Optimum Black TRS 90 Min Black TRS 1 Min Black
Ultra Black Optimum Black The Right Stuff 90 Minute Black The Right Stuff 1 Minute Black
Customer Reviews
4.7 out of 5 stars
17,730
4.7 out of 5 stars
17,730
4.7 out of 5 stars
17,730
4.7 out of 5 stars
17,730
Cure Time 8 Hours 8 Hours 90 Minutes 1 Minute
Feature Flexible and Oil Resistant Max Flex and Oil Resistance 90 Minute Cure Fastest Return to Service
Appliactions Oil pans, timing covers, transmission pans, differential covers Oil pans, timing covers, transmission pans, differential covers Oil pans, timing covers, transmission pans, differential covers Oil pans, timing covers, transmission pans, differential covers

What's in the box

  • Gasket Maker
  • Looking for specific info?

    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    17,730 global ratings

    Customers say

    Customers like the quality and value of the gasket. For example, they mention it works well, is easy to use, and performs better than other brands. That said, opinions are mixed on durability, ease of cleaning, and drying time.

    AI-generated from the text of customer reviews

    889 customers mention753 positive136 negative

    Customers like the quality of the gasket. They say it works well, performs better than other brands, and is easy to apply. Some say it's perfect for any gasket that lets oil escape.

    "...surprised to find that even after months of usage, the gasket remained intact and showed no signs of cracking or deterioration...." Read more

    "...Worked well using a thin layer to set automotive gaskets prior to reassembly...." Read more

    "...The paper gasket tore so I used this instead, no issues at all and easy to apply." Read more

    "Quality product. Works well. Great price. Fast shipping." Read more

    352 customers mention305 positive47 negative

    Customers like the seal. They say it seals everything well, bonds like crazy, and repels water. Some say it's the best silicon sealer they've ever used, and it has better oil resistance.

    "...Its exceptional performance, unmatched oil resistance, sensor-safe formulation, high flexibility, and helpfulness tips make it a must-have for any..." Read more

    "...Good surface preparation was key to proper adhesion. No leaks to date, so very satisfied given the time, effort and cost to disassemble, clean,..." Read more

    "This worked great for sealing my valve cover at the seam between the heads and timing chain cover...." Read more

    "...Followed directions, zero leaks, cures just as fast as directions state: finger tighten, then 60 minutes wait, then torque to spec, then 30 minutes..." Read more

    149 customers mention121 positive28 negative

    Customers like the value of the gasket. They say it works great, saves them a couple of bucks, and blends in adequately. Some mention that the price is good for the size.

    "...Plus, its affordability and ease of use make it accessible to everyone, regardless of their skill level...." Read more

    "Quality product. Works well. Great price. Fast shipping." Read more

    "No issues, it does the job. Good sealant, cheaper than local stores." Read more

    "Good price far the size" Read more

    94 customers mention94 positive0 negative

    Customers find the gasket easy to use. They mention that it sticks to any surface, it gives you a few minutes to apply, and it makes installing the gaske much easier. The material goes on very easily and allows it to dry for 2 days. Customers also appreciate the helpful tips and exceptional performance of the product.

    "...incredible product, highlighting its exceptional performance, helpfulness tips, and why I believe it deserves a resounding 5 out of 5 stars...." Read more

    "...The paper gasket tore so I used this instead, no issues at all and easy to apply." Read more

    "Easy product with an easy review! Works exactly as advertised and should. No complaints on this." Read more

    "...I was one step away from buying a whole new hot tub. No leaks. Easy to use!" Read more

    67 customers mention58 positive9 negative

    Customers like the adhesion of the gasket. They say it's very strong, can stick to most surfaces, and holds them in place. It's easy to apply and holds well, and is water proof. Customers also mention that it has the right consistency when applying, and sets up fast but not super fast. Overall, customers are satisfied with the adhensive power of the product.

    "...Good surface preparation was key to proper adhesion...." Read more

    "...occurred to the pan and it does come off but the adhesion is extremely tight...." Read more

    "...For my use, it has the right consistency when applying, sets up fast but not super fast...." Read more

    "This has very strong tensile strength as well as adhesive strength and can be used to hold moldings in place repair parts as well as used as a gasket." Read more

    64 customers mention24 positive40 negative

    Customers have mixed opinions about the durability of the gasket. Some mention that it lasts a long time, showing no signs of cracking or deterioration. They also appreciate the soft but tough rubber that is solvent resistant. However, others say that it became brittle and cracked in half. The dispenser with a nozzle snapped in half, and the bottom of the bottle ripped.

    "...The paper gasket tore so I used this instead, no issues at all and easy to apply." Read more

    "...months of usage, the gasket remained intact and showed no signs of cracking or deterioration. It's like a gymnast doing backflips effortlessly!..." Read more

    "...Unfortunately it showed up missing said dispenser with a nozzle snapped in half!..." Read more

    "...on all their silicone tubes are prone to becoming brittle and cracking in half...." Read more

    53 customers mention17 positive36 negative

    Customers have mixed opinions about the ease of cleaning the gasket. Some mention that it cleans up well with Goo Gone and paper towels, while others say that it makes a huge mess and is a nightmare to clean up.

    "...Application can be messy if you get in a hurry but its ability to create a tight seal with a firm holding power would be hard to duplicate this side..." Read more

    "Pressure dispenser is convenient and keeps things clean but not closing when twisting as instructed 90% of the time." Read more

    "...Really happy with Permatex Ultra Black. Messy yes, but it cleans up well with Goo Gone and Paper Towels...." Read more

    "...The stuff is pretty messy, so wear rubber gloves." Read more

    46 customers mention16 positive30 negative

    Customers are mixed about the drying time of the gasket. Some mention that it works well and holds strong, while others say that it worked well but was mostly dried out. Some customers also mention that the larger packages dry up after using them. Overall, the quality of the product is high, but the drying times are long.

    "...This obviously dried the sealant out and made it completely unusable, and to add insult to injury, AMAZON WILL NOT ACCEPT THIS FOR RETURNS!!!..." Read more

    "good stuff, dries quick, nice and tacky, spreads easily and very versatile...." Read more

    "...and the tube was screwed on but the Permatex was pretty dried up near the outlet and I could not squeeze any out...." Read more

    "...will not dry at room temp if bead is thicker than about 3/8”. not very black so the name is incorrect. it’s charcoal gray." Read more

    So far so good
    5 Stars
    So far so good
    I used this to seal an exhaust connector with warped and rust pitted exhaust flanges. The flanges were warped giving then a convex bow. The result was a 2-3mm gap with even the thickest gasket available. After grinding and cleaning the surfaces, a1/4 inch bead of Permatex Grey mated well with the samformed a seal that has held under normal conditions for a week. The fix looks as clean as possible and I trust that it will continue to hold.
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    Top reviews from the United States

    Reviewed in the United States on June 13, 2023
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    25 people found this helpful
    Report
    Reviewed in the United States on March 6, 2024
    Style: Pack of 1Size: 3 ozColor: Right Stuff 90 Minute BlackVerified Purchase
    Reviewed in the United States on February 13, 2024
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    2 people found this helpful
    Report
    Reviewed in the United States on February 26, 2024
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    Reviewed in the United States on March 18, 2024
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    Reviewed in the United States on March 4, 2024
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on March 24, 2024
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    Reviewed in the United States on December 16, 2022
    Style: Pack of 1Size: 3 ozColor: Right Stuff 90 Minute BlackVerified Purchase
    31 people found this helpful
    Report

    Top reviews from other countries

    Translate all reviews to English
    Jf
    5.0 out of 5 stars Toujours aussi bon
    Reviewed in Canada on February 27, 2024
    Style: Pack of 1Size: 5 ozColor: Right Stuff 1 Minute BlackVerified Purchase
    Abdullah
    5.0 out of 5 stars Good quality 👌
    Reviewed in Canada on December 3, 2023
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    Customer image
    Abdullah
    5.0 out of 5 stars Good quality 👌
    Reviewed in Canada on December 3, 2023
    So I had to replace my Engine Valve Cover Gasket for my mazda 5 because oli started leaking inside the spark plug I used this silicone and it worked very good 👍
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    Jessica Victoria Hernández Delgado
    5.0 out of 5 stars Bueno
    Reviewed in Mexico on December 15, 2023
    Style: Pack of 1Size: 3 ozColor: Ultra BlackVerified Purchase
    Juan R.
    5.0 out of 5 stars Bueno
    Reviewed in Mexico on March 8, 2021
    Style: Pack of 1Size: 3 ozColor: Right Stuff 90 Minute BlackVerified Purchase
    ray scott
    2.0 out of 5 stars poor value
    Reviewed in the United Kingdom on March 7, 2023
    Style: Pack of 1Size: 0.5 ozColor: Ultra BlackVerified Purchase