• Composite Molding


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


  • Solvent Based
  • Absence of mold buildup
  • Excellent adhesion to substrates
  • High degree of slip
  • Multiple releases per application
  • No interference with post finishing
  • No transfer
  • Non-oily film
  • Will not cause knit lines

MAC 971 - Semi-permanent Release


MAC-971 is a solvent-based coating that will bind to the mold surface but not transfer to the molded part. This product will cure at room temperature and provide a dry, colorless, coating that is inert and thermally stable.

Technical Data:

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

Application Method:

    Apply to a clean, dry mold surface. We recommend use of a solvent to clean the surface of the mold before application. The product may be sprayed, brushed or wiped (non-linen rag) onto the mold. Apply two or three base coats allowing for 30-minutes of dry time between coats. After the final coat is applied, allow at least 60-minutes for the coating to cure. Accelerate cure time with heat (250°F). Drying and curing will depend upon ambient temperature and humidity. The mold should be re-coated after the first two or three pulls. Additional coats may be applied as touch-up to increase the coating longevity.

Safety and Handling:

    The Safety Data Sheet for MAC-971 should be reviewed before using the product. The product is solvent-based and should be kept away from heat, sparks and flames. Appropriate safety equipment is recommended when handling MAC-971.


1-gallon, 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.