Hi, the glass will take on

[lorraine]

Hi, the glass will take on any marks or texture on the moulds.  The Boron nitride will always leave texture which can alllow it to get trapped in the glass, try using kiln shelf paper between the glass and boron coated mould.

Don’t worry that the paper may not be conforming to the mould as it fires it will go with the glass, hope this helps

Lorraine