Glass thinning on project
Posted: Wed Mar 17, 2004 11:33 pm
I have a sporadic problem with an area of glass getting thin and uneven on different areas on different projects. Sometimes the underside of the glass where the thin area is has a very shiny firepolished look, and it is slightly indented. Sometimes the underside is flat like it should be.
This has occured with different size projects, different firing schedules (some pretty slow), on both Spectrum and Bullseye glasses, different thicknesses and different primers (Hi-fire & Primo). I have also lowered the firing temp to 1450 instead of my normal 1475 (bullseye).
For a while I was thinking that I wasn't letting the shelves cool off enough after curing the primer, but that does not seem to be the problem.
My guess is that some (or just 1) of my shelves are uneven and just every once in a while I seem to pick the spot to avoid (which would explain why it doesn't happen all of the time). I've tried to use a ruler to pinpoint an area, but I cannot see anything, might it be just very slight and hard to see?
Has this happened to anyone else? I really appreciate any help or thoughts you might have on this problem. I am so tired of ruining things and having no idea why.
Thanks in advance, Jen b
This has occured with different size projects, different firing schedules (some pretty slow), on both Spectrum and Bullseye glasses, different thicknesses and different primers (Hi-fire & Primo). I have also lowered the firing temp to 1450 instead of my normal 1475 (bullseye).
For a while I was thinking that I wasn't letting the shelves cool off enough after curing the primer, but that does not seem to be the problem.
My guess is that some (or just 1) of my shelves are uneven and just every once in a while I seem to pick the spot to avoid (which would explain why it doesn't happen all of the time). I've tried to use a ruler to pinpoint an area, but I cannot see anything, might it be just very slight and hard to see?
Has this happened to anyone else? I really appreciate any help or thoughts you might have on this problem. I am so tired of ruining things and having no idea why.
Thanks in advance, Jen b