Boron Nitride after Kiln Wash?

[smallbitz]

In several small bowls (ceramic bisque) that I do some production work in, the kiln wash eventually chips, needs to be sandblasted out and re-washed. I was curious if I sandblasted them really well of all kiln wash, could I spray them with MR97 or Slide 1800? It sure would be easier than having them chip - just re-spraying them.

Anyone done this? Thanks in advance!

Dot

[Jeanice]

I have a few molds that I have done this and I love the smoother surface. Remember that once you use BN you can't go back to kiln wash. As far as using Slide... I have had two issues with glass sticking to molds when using BN, both happened when using Slide. The glass never did come off the molds.

[smallbitz]

Thanks. I'm gonna blast that KW off and spray them with MR97. I've only used it on SS molds in the past, but I sure think it will be easier on these particular molds! Glad to know it will work. I'll be sure not to use KW on them after the MR97.

[Marian]

I have the steep sided jumping bean 3x3 molds from Slumpy's . I used MR 97 on them when they were new and they were so slippery the glass blanks slid off sideways in the slump cycle. I scrubbed them with a green scrubby pad and then used just alumina hydrate mixed with water in a spray bottle to recoat. The MR 97 appeared to wash off, no big deal. The molds are fine, not so slippery now, the MR97 didn't cause any more trouble. I use the molds constantly again, I do recoat often as the corners can bind, alumina just washes off and they can be coated easily. Bert Weiss has many posts on kiln wash and alumina powder.

[Laurie Spray]

I would never sandblast one of my ceramic molds. Seems too harsh, could cause damage to the mold and really not necessary . To get old kiln wash off it just sakes fine sand paper or a green scrubbie. Although we are a supplier for MR97 I do not use it on my Bottomless Molds. You can....but I just do not get the point when Bullseye kiln wash applied once lasts many many (did I say many?) firings. I do use it on all of my casting molds and on our new Texture molds.