Lois Stevens on thu 16 jan 03
Help! I've been using commercial underglazes and stains mixed with slip
and I've been having a big problem with the underglaze and and glaze
crawling off of areas on the rims of my pots. I paint my pottery with the
uderglazes and slips and then bisque to cone 05 and then coat with a clear
commercial glaze and fire to cone 5. I have no problem with the body of my
work but I've been getting a lot of bare spots on the rims of both thrown
and slab pieces. any suggestions would be GREATLY appreciated as it is way
too costly to have to refire so many pieces.
Thanks!
Paul Gerhold on fri 17 jan 03
Try adding a small percentage (10 to 20 ) of the commercial cone 5 glaze to
the underglaze. This will require some experimentation but will most likely
solve your problem-works for me.
Paul
karen terpstra on fri 17 jan 03
Hi Lois,
You didn't say what firing range your commercial underglazes and clay
goes to. I'm assuming it is all cone 5? My first guess would be that
maybe the glaze and slip around the rim are too thick. Other thoughts:
underglaze is a bad "fit" for the claybody (for example if you are using
cone 04 underglaze or cone 10 slip). Is the work clean, with out dust
or oil from handling?
Sincerely,
Karen Terpstra
La Crosse, WI
From: Lois Stevens
Help! I've been using commercial underglazes and stains mixed with slip
and I've been having a big problem with the underglaze and and glaze
crawling off of areas on the rims of my pots. I paint my pottery with
the
uderglazes and slips and then bisque to cone 05 and then coat with a
clear
commercial glaze and fire to cone 5. I have no problem with the body of
my
work but I've been getting a lot of bare spots on the rims of both
thrown
and slab pieces. any suggestions would be GREATLY appreciated as it is
way
too costly to have to refire so many pieces.
Thanks!
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