Jerry-talc question

Well, bubbles are the result of something between the bottom of your glass and the shelf/talc/mold. Talc doesn't cause bubbles. In fact, glass painters use talc on their kiln shelves so the back of their glass doesn't have any texture on it. So I'm not sure what caused your problem. Bubbles that come up from the bottom of the piece are, in my opinion, the hardest problems to solve.

Now, about the change in the shape; can you say a bit more about what you were actually doing? My memory isn't as good as it used to be and I can't remember what you wanted to do. I'll do my best to help you through all this.

Jerry

Liam Striker wrote:

I was trying to duplicate a pattern of texture from one glass to another. An impression was made in a bed of talc from one glass, and another was slumped over the talk to try and achieve the same pattern. placing cold glass over the talk somewhat mashed the pattern in the talc. I then stilted the glass on the ends by 1/4" and slumped down into the pattern. Better results but still some flat spots. And of course I had bubbles. As far as the bubbles go, It was trapped air. I assumed that it would be able to disperse thought the talc, but I guess it couldn't

Liam

LIam, I just had a thought about this particular bubble situation, Are you using a shelf primer of some type on the shelf under the talc? Are you putting a shelf primer on your Hydroperm molds?

Some shelf primers will "gas off" at particular temperatures or at particularly rapid ramp cycles. Something to think about. With Hydroperm you do NOT use shelf primer, the glass will not stick to the plaster, leaves a very smooth surface in the glass, very nice.

If you are using Talc to pick up a pattern, you don't need shelf primer because the glass is setting on the talc, not the shelf.

Just a thought.

i remember seeing a fellow's work that incorporated a paste of kiln wash as opposed to a liquid that was applied with a cake decorating kit and used to create some really cool textured pieces. Perhaps mixing the kiln wash thick, applying the pattern piece, then letting dry before firing your new piece??? m