• Composite Molding


  • Polyester
  • Thermoplastic Resins
  • Thermoset Resins
  • Fiber / Resin Composites
  • Epoxy / Fiber Composites


  • Solvent Based
  • Absence of mold buildup
  • Dry colorless clean nonoily film
  • Excellent adhesion to substrates
  • High degree of slip
  • Multiple releases per application
  • No interference with post finishing
  • No transfer
  • Thermaly stable to 1000ºF
  • Will not cause knit lines

MAC 971 Semi-Permanent Release Coating for Composite Parts


MAC-971 is a solvent based mixture of a resin solution that will bond to the applied surface allowing for no transfer to the molded part. Product will cure at room temperature to provide a durable, dry, colorless, chemically bonded film coating that is inert and thermally stable. Suitable for use with epoxies (thermosets and prepregs), phenolic, polyester and thermoplastic compounds.

Technical Data:

  • Color and appearance................Clear Liquid
  • Dispersing medium....................Heptane
  • Specific gravity..........................0.7
  • Weight per gallon (lbs.)..............5.7

Application Method:

    For best results, mold surface should be cleaned thoroughly. Previously used release products (waxes, silicones, oils, etc.) and sealers should be completely removed before application. The product should be applied by spraying, brushing or wiping with a clean, dry, lint-free cloth so that a thin, wet, continuous film is deposited. Initially, apply two to three base coats, allowing 30 minutes between coats for the solvent evaporation. After the final coat is applied, allow at least 60 minutes for the coating to cure. Curing can be accelerated by heating the mold for five minutes at 250°F. Note: The drying/curing times will be dependent on ambient temperature and humidity. For best results the mold should be re-coated after the first two to three pulls. Additional coats may be applied as touch-up to increase the coating longevity.

Safety and Handling:

  • The Material Safety Data Sheet for MAC-971 should be reviewed before using the product.
  • The precautions to be observed in handling MAC-971 are those related to the solvent. These solvents are flammable, and thus, the product should be kept away from heat, sparks and flames. Safety glasses and gloves are recommended when using this product.


Gallon Container, 5 Gallon Pail, 55 Gallon Drum.


For expert technical assistance in selecting the optimum product to meet your specific requirements and to be convinced of the benefits of McLube lubricant coatings, we recommend you evaluate the appropriate product under your specific conditions. Samples and technical assistance are available, as well as custom formulations that suggest themselves for a specific application.