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US Part Number: 27037
Canada Part Number:

Permatex® OPTIMUM BLACK Gasket Maker

Specially formulated for high flexibility and maximum oil resistance.

Permatex OPTIMUM BLACK  Gasket Maker retains the highest flexibility and maximum resistance to oil and common shop fluids. Optimal choice for today’s lightweight and premium components, especially where two dissimilar metals meet. OPTIMUM BLACK  offers a temperature range of -65°F to 500°F and is 15% stronger and 60% more flexible than Permatex Ultra BLACK . Extra nozzle included to avoid nozzle clogs and deliver maximum use. OPTIMUM BLACK  is sensor safe, low odor, and non-corrosive. It is resistant to auto and shop fluids and vibration. OPTIMUM BLACK  is one of the most advanced, high flex, maximum oil resistant RTV silicone gasket makers available.


OPTIMUM BLACK  Suggested Applications:

  • High Flex: Assemblies where two dissimilar metals meet.
  • For newer lightweight & premium components.

Valve covers, oil pans, oil pumps, intake manifold end seals, timing gear covers and differential covers.

US Item #CDN Item #Container SizeCase
27037N/A3.35 oz tube, 2 nozzles, carded12
US Item #Tech Doc File
27037TDS  SDS  

OPTIMUM BLACK Instructions:

  1. For best results, surfaces should be clean and dry.
  2. Cut nozzle and apply a continuous 1/16” to 1/4” (2 to 6mm) bead of silicone to one surface, surrounding all bolt holes. Assemble parts immediately while silicone is still wet. Finger tighten until material begins to squeeze out around flange.
  3. Let dry for one hour then tighten to torque specifications.
  4. Allow 24 hours to fully cure before filling with fluids or returning to service.
  5. Replace cap after use.

NOTE: Not recommended for use on head gaskets or parts in contact with gasoline.

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Tech Documents

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