I'm finally set on what I'm using to coat the soft bricks in my electric-to-soda kiln conversion project. Now I wonder: Do I have to cook it on before I fire it with pieces inside?
I've read that I need to bring it to bisque temp, empty - if so, why? Is there a reason I can't just paint it on today, load it tomorrow with pieces,fire it (now full) the next day? I single-fire, super-slow for the first few hours, if that makes a difference.