Boron Nitride Spray Will Prime Steel
And Ceramic Glass Fusing Molds

Sold in an aerosol spray can, boron nitrate spray is now being made by a number of manufacturers.

Stainless steel fusing molds do not need to be heated when using a boron spray as is customary with kiln wash.

Once this spray primer is applied to a glass fusing mold, you cannot go back to normal kiln wash for future glass kiln firings; the surface is sealed and won't fully accept kiln primer.

As a fine powder is sprayed on the glass fusing mold, it is advisable to either spray outside or in a well-ventilated area, a face mask is highly recommended.

Spraying

If the mold has been previously coated with kiln wash, it should be completely removed by careful brushing.

Once the mold is cleaned, even coats of spray will need to be applied, allowing each coat to dry before applying the next coat.

Allow the last coat to dry for about fifteen minutes before adding glass.

Do not saturate the mold; just apply light even coats to the mold surface.

Always follow the suppliers instructions carefully.

As the mold coating is very thin, care needs to be taken when placing fusing glass in the mold. Where possible it is better to work with glass powder or fine to medium frit.

Large glass pieces may scratch the surface and cause the glass to stick to the mold.

After removal from the glass fusing kiln, the mold should be gently brushed to remove any left over spray.

The mold surface should look shiny; apply one coat of spray until the surface appears matte, touch up any shiny spots with spray.

Fused Glass Cleaning

Fused glass should be cleaned with gentle dish wash liquid or a mild abrasive to remove any remaining boron spray.

It is important to remove any spray, as it will prevent the glass fusing if it needs to be fired again.

Before purchasing a BN spray, a careful examination of the sprays available is most important, from not only a pricing difference, but also whether a particular spray suits your needs.

Improper use, or faulty product, may result in glass sticking to the mold or mold breakage.

This spray should be used for mold protection and release only.

A search of the Internet will produce more detailed information on the use of Boron Nitride spray.