Dave Finkelnburg on sun 6 jul 03
John,
There are three things you need to try.
First, search the Clayart archives for information on single firing.
There's good information there.
Second, if you get really serious about the subject look for the book,
"Single Firing" by Fran Tristram. Its well-written, an easy read, not long,
but covers all the basics well.
Third, just try what you have asked about. Experiment! :-)
Applying glaze to bone dry greenware can be problematic. Spraying is
good. As you suspect, you can soften the clay with dipping. How much that
is a problem depends on whether you have attachments, like handles, and
whether you have thick and thin spots, and how thin your ware is. You can
spray or brush in stages and build a thick glaze coat. There are so many
variables, it's best to give it a test. You can glaze greenware at leather
hard with fewer problems, but in a dry climate it's hard to keep the ware
evenly green. Also, you want glazes higher in clay so they shrink with the
ware and don't fall off.
In general, though, you can carefully use any of your regular glazes on
bone dry greenware and single fire and get an idea of how single firing
works.
You are right to follow a bisque firing schedule up to cone 08 or so
before speeding up to a glaze firing schedule. If you fire too fast at
first with raw ware you can get blistering and other faults that also occur
with inadequate oxidizing firing of bisque.
I hope this helps.
Dave Finkelnburg on another perfect summer day in southern Idaho
----- Original Message -----
From: "jnybravo2"
> I have heard about "once firing" pottery. I would like to try, but
> am unsure about how to apply glazes. Is it ok to dip the work? I am
> concerned the wet glaze will cause the piece to fall apart. I am
> thinking that the best way would be to spray or brush the glaze on.
> But, sometimes I like the effects of dipping better. Can I put the
> glaze on as heavy as when the work is bisque fired?
> And then, how about firing. Do I need to candle the work very long
> before ramping up the temp or can I proceed as if the work was bisque
> fired? I wouldn't think there would be any different procedures
> after the glaze gets to melting temp.
jnybravo2 on sun 6 jul 03
I have heard about "once firing" pottery. I would like to try, but
am unsure about how to apply glazes. Is it ok to dip the work? I am
concerned the wet glaze will cause the piece to fall apart. I am
thinking that the best way would be to spray or brush the glaze on.
But, sometimes I like the effects of dipping better. Can I put the
glaze on as heavy as when the work is bisque fired?
And then, how about firing. Do I need to candle the work very long
before ramping up the temp or can I proceed as if the work was bisque
fired? I wouldn't think there would be any different procedures
after the glaze gets to melting temp. Thank you in advance for your
time and your help.
John in Saxapahaw, North Carolina, where the Fourth of July was nice
and sunny and hot, as it should be.
J. Horner, Jr.
http://PawPawsPottery.freeservers.com
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