This is part two of a two part series on
boron nitride. Click here to go to the beginning of the
1. Boron nitride can be used on both stainless
steel and clay molds. It performs much better on molds than on
the kiln shelf, so is best used for slumping activities only.
2. Apply boron nitride out doors or in a
well ventilated area. For best results, apply at room
temperature to a mold with a clean surface. Stainless steel
molds can be heated, but it's best to apply the product at room
temperature onto a mold that has been roughened with sandpaper or
3. Spraying is better than brushing.
If using the aerosol form of boron nitride, remember that it is under considerable
pressure, so spray very carefully. Overspray or spray back is a
4. For best results, cure the spray
before using it with glass. Air dry for several hours, then
fire to 200F/93C and soak for four hours. Finally, heat to
1300F/700C to make the finish harder and longer lasting.
5. After curing, the mold can be used
as normal for slumping. You may see a small amount of
residue on the glass after the first few firings, but it can easily
be wiped off.
6. The product will last for quite a
few firings before it needs to be reapplied. If properly
cured, it can easily last for dozens of firings.
Copyright 2005 Brad Walker.
All rights reserved.