Unglazing a mold?

[Paul Tarlow]

Has anyone ever taken a glazed ceramic piece and sandblasted off the glaze in order to use it as a mold?

Thanks,

- Paul

[Lynn g]

Sort of..partially. I bought a couple of nice square plates at Cost Plus and sandblasted off the glaze; drilled vent holes (had to buy 2 glass/tile drill bits because the first one from Lowe's broke). I have kiln-washed one of them but haven't had a chance to try it yet. Will try to get a test done in a couple of days (other project going on right now) and let you know. I can't think why it wouldn't work. Supposedly you can even do it without removing the glaze if you put enough kiln wash on.

[rosanna gusler]

you might want to just roughen the glaze enough to hold kiln wash. it is hard to get all the glaze off of the softer clay underneath with out changing its shape. or maybe i was just heavy handed. rosanna

[Glenda Kronke]

Has anyone ever taken a glazed ceramic piece and sandblasted off the glaze in order to use it as a mold?

Thanks,

- Paul

yes. many times. no problems.
Like Rosanna suggested, just a light blast to rough up the surface so the kiln wash will stick.

go for it.

[gthomson]

i've heard that glass etching cream will work. Anybody know for sure?

Glenn

[charlie]

it probably depends upon the specific glaze. some will, some won't.