Post #491165 by MadDogMike on Sat, Oct 31, 2009 10:56 AM

Thank you all for the kind works to ease my transition to old-foggy grampa-dom :lol:

But now I' singin' the :music: "Can't get my Underglazes Right Blues" :music: :( Picked up some Duncan Cover Coat underglazes and some Duncan Concepts underglazes for a very important project I'm working on and they're giving me fits. GROG, I feel your pain. The Covercoats seem to work OK, can be put on greenware or bisque but greenware just seems a little delicate to be messing with. But I'm having all kinds of problems with the Concepts. To start with, it fires to a gloss - I thought underglazes fire to a matte finish? I fired them first, then put a clear over them and fired again (not sure why I did that if they were already glossy?) Parts of the Concepts Underglaze/clear glaze combo actually CHIPPED OFF, taking pieces of ceramic with it! WTF!? Any advise from the glazemasters?

EDIT - THE PLOT THICKENS!
I went out to reload my kiln and may have found the problem. My kiln uses a kiln sitter - a little bar that bends when the right temp is reached and turns the kiln off. Here is a pic of a normal used bar (top) and of the one from yesterday's firing

Looks like the bar failed and the kiln got too hot, eventually turning off by the backup timer a couple of hours too late. Hmmm.....

Clay, the original and most divine art media - Genesis 2:7

[ Edited by: MadDogMike 2009-10-31 13:04 ]