Call us at (661) 257-4060

Grubercare MR Sealer Print

Step 4 of the GruberCare Semi-Permanent Mold Release System


GruberCare™ MR Sealer is designed as a mold sealer for glass reinforced polyester, vinyl ester, epoxy or metal molds. GruberCare™ MR Sealer is an advanced polymeric resin in an organic solvent blend. GruberCare™ MR Sealer is especially recommended for use on new molds and repaired areas on older molds.

For use in combination with the MR GP and MR HI-TEC products. It should be used to prevent styrene emission or migration from new molds and eliminate surface porosity of metallic molds. The resin both seals micro porosity and fills minor scratches on the mold surface. The result is a smooth, high gloss surface primed for GruberCare top-coat application. GruberCare™ MR Sealer is especially recommended for use on new molds and repaired areas on older molds.


Product Benefits:
  • Efficient mold sealer and primer
  • Easy application
  • Enhances mold gloss (see application details for appropriate coating technique)
  • Low odor
  • Minimal mold build-up
  • Versatile, can be used on all mold surfaces
  • Durable; provides semi-permanent base-coat for mold release agent top coats


MR Sealer - Technical Characteristics
Specific Gravity:
6.51 lbs. per gallon approx.
Physical Appearance:
Flash Point:
82ºF and above
Approximately 800-1000 sq. ft. per gallon
Solvent Mixture:
Mixture of Aliphatic Hydrocarbons

Application Procedure:

Please read Material Safety Data Sheet before use.
  1. Wet a small, clean cotton cloth liberally with MR Sealer.  Apply evenly to large areas of the mold.  Allow the mold to remain wet at least 20-30 seconds or until the wet film begins to dry and separate.
  2. Then, with a large, clean, dry cotton cloth, wipe over the applied area ONCE. This smooths over the application and leaves a thin moist coating. Do not continue wiping until the surface is dry.
  3. Continue in this same manner until entire mold has been coated.  Allow each coat to cure at least 15 minutes before applying the next coat.
  4. Apply 3 coats of MR Sealer to refurbished tooling. Extra coats may be applied if tooling is new or over areas which have been newly repaired.
  5. For optimum performance, allow MR Sealer to cure for 1 hour after applying the final coat.
  6. The complete sealer coat application should be followed with 3-4 coats of either Step 5A MR GP or Step 5B MR Hi-Tec.


Top-coat: GruberCare MR Sealer can be used a sealer and primer for any GruberCare top-coat, e.g. MR GP or MR Hi-Tec. See the specific technical data sheet for application information.

Note: The polymeric resin used in GruberCare MR Sealer reacts with moisture. Please ensure can is resealed after use. GruberCare MR Sealer is supplied ready to use, no shaking or mixing is required. Do not mix with other products or solvents.


Description/Order Number

Quart - Ea - #MR0102
Quart - Case of 10 - #MR0103
Gallon - Ea - #MR0104
Gallon - Case of 4 - #MR0105
Squeeze Bottle - 1 Pint - Ea - #MR0601-1  (Note: Discontinued. Call for availability before ordering).


View/Download MSDS


The user will determine the suitability for use of this product. The recommendations / data given above are based on information we believe to be accurate. They are intended to be used only as a guide for selection for end-use evaluation and do not constitute a product specification. Gruber Systems cannot assume responsibility for results obtained by use of this product as we have no control over end-use applications or handling. Gruber Systems therefore specifically disclaims any damage or loss of any kind in relation to the use of this product.