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Boron Nitride Spray

Hexagonal Boron Nitride (hBN) Aerosol Spray

At Glaze we use Boron Nitride as a mold coating to stop the glass sticking to our glass molds. You may also choose to use a kiln wash which does the same job.The reason we use Boron Nitride is that it is quicker and easier than kiln wash.

Boron Nitride Spray is an aerosol mold release primer for slumping and fusing molds.

MR 97 - Boron Nitride Mold Release is a unique industrial strength formula that delivers superior results for glass artists.

  • Releases quickly, covers completely and is easy to use

  • Contains at least three times more Boron Nitride than other brands to deliver better coverage with fewer coats

  • Works up to 1800°F with glass

  • Works with both ceramic and stainless steel molds

  • Is ideal for highly detailed molds like Colour de Verre

Directions for Use


Applying MR-97 Mold Release to your ceramic or stainless steel molds is quick and easy.

Follow these simple steps:

  1. Remove all the old primer from a previously used mold with a stiff nylon kitchen or tooth brush.

  2. Shake the container thoroughly EACH TIME you spray to make sure that the contents are completely mixed. Shake until the metal mixing balls are audible for about a minute.

  3. As with all aerosols, you must hold the can upright when spraying to ensure that the proper mix of MR-97 and propellant is released.

  4. The first time MR-97 is used on a mold, you must apply TWO coats of the product. Hold the can 8 to 10 inches from the surface. Hold both the can and the mold upright.


- For smaller, shallow molds, apply the first light coat using a two to three second burst of spray in a sweeping pattern across all the mold’s cavities.

- For larger, deeper molds, use a three to four second blast making sure to cover the deepest recesses. The entire surface must be thinly but completely covered.

- Cover completely but DO NOT SATURATE THE SURFACE!

- Set the mold aside for about five minutes so it can dry completely. Once dry, apply the second light coat in the same manner. Let the mold dry for fifteen minutes.

-  NOTE: When the can of MR-97 is less than half full, it sometimes doesn’t spray the product as heavily. In this case, increase spray time by a second or two.

  1. Fill the mold, taking care to avoid scratching the surface of the MR-97. Powder or fine mesh frit is preferable as larger frit can scratch the surface and create a potential sticking problem.

  2. For all future castings, gently clean the mold with a brush to remove any fine residue from the previous use. The cleaned surface will appear shiny. Then apply only ONE coat of MR-97. The surface should now look matte. Touch up any shiny spots with a little more spray.

  3. Wash any residual Boron Nitride from your glass casting using warm water and dish washing liquid or a mild abrasive like Soft Scrub®. Rinse thoroughly and dry. Residual Boron Nitride on your casting will prevent your components from tack fusing properly in your next firing.

This procedure applies to your stainless steel as well as ceramic molds. It is not necessary to pre-heat your stainless molds before applying MR-97.


  • Shake the can thoroughly EACH TIME you apply MR-97, hold the can & mold upright, and DON’T SATURATE the mold!

  • Be careful not to scratch the surface of the MR-97 with a tool or the sharp edges of coarse frit when filling your mold and loading your kiln.

  • Once you use MR-97 on your mold you can’t go back to traditional primers. Boron Nitride (BN) seals the surface of the mold and the primer won’t be absorbed evenly.


Follow the suggestions in our Safety Precautions on the right side of this page, with particular regard to how and where you should spray your mold.

For a demo, watch the video at the top of this page “Priming Colour de Verre molds with MR-97”.

Safety Precautions

  • The propellants used in our aerosol cans are compressed flammable gasses, details of which are covered in our Material Safety Data Sheet. Do not spray near sparks, heat or open flame.

  • CONTENTS UNDER PRESSURE. Avoid prolonged exposure to sunlight or heat from radiators, stoves, hot water and other heat sources that may cause bursting. Do not puncture, burn, or incinerate. Store product below 120F.

  • USE WITH ADEQUATE VENTILATION. Keep area ventilated during use and until all vapors are gone. Avoid continuous breathing of vapor and spray mist.

  • DO NOT SMOKE WHILE USING THIS PRODUCT. Extinguish all flames, pilot lights and heaters. Turn off stoves, electric tools and any other sources of ignition.



  • EYE CONTACT: Flush eyes thoroughly with water for 15 minutes. If irritation persists,seek medical attention.

  • SKIN CONTACT: Wash thoroughly with mild soap and water.

  • RESPIRATORY DIFFICULTY: Remove from exposure & provide fresh air.

  • We recommend that Safety Glasses, Particulate Mask and Nitrile gloves be used when spraying.




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