Helena Leary-Heinz on mon 15 apr 02
Hi All,
I have to emphasize that I'm not a certified instructor in PMC or even
terribly experienced for that matter... I just ask a lot of pesky questions
at workshops and then I can tell you what works for me. ;^)
> Wouldn't there be a problem resulting from the very high shrinkage of the
> PMC? Or is that what the special instructions are about? If so, would you
> mind telling us how it's done?
There aren't really special instructions, it's just that you allow for the
shrinkage to express itself in another way. The PMC will express it's
shrinkage by 'thinning out', rather than by separating.
For a rim you don't fire the PMC part before attaching it to the fired and
glazed clay piece. You will want to roll a coil rather than a slab and fit
the coil over the edge of the cup. You shouldn't need any slip, but where
your coil meets itself you'll want to overlap at least 3/8" (guestimate) and
blend the ends of the coil together (a drop of water will do this) so that
they are one piece. Remove excess clay so that the overlapped section is
the same size as the rest of the coil around the rim.
Because of the shrinkage, the coil should look way too fat for the edge of
the cup. The thing to remember about cup rims is that if it's too thin
before it's
fired, you will get spots where it completely burns away and the rim will be
blotchy. Of course, one of the great things about PMC is that if you do
have a lip that's too thin and part of it burns away, you can just apply
another layer of PMC just like you did the first time and build up
successive layers. The only caution I would add is that if you had to put
another layer on you should clean away the white film that the organic
binder leaves behind before putting on your next layer of PMC.
Anyway, that's what works for me. There may be experts out there that do it
differently. For opinions from certified PMC folks you can visit
www.pmcguild.com or www.pmcconnection.com . I have to say that I was really
impressed with Vera Lightstone's work at NCECA 2001 so check her stuff out.
Yours in clay, (silver or otherwise)
Helena ~~
Artful Elements
"That which is to give light, must endure burning" Viktor Frankl
Millie on tue 16 apr 02
What about using the silver version of the platnium that Carla used
on the base of her cup for the clayart exchange. I don't remember
what it is called, but it is a fired on glaze, overglaze (?) that is
beautiful. Carla or some one else is bound to remember what it is
called.
Millie in Md. I have a nice sunburn from being at a demonstration
of support for Israel yesterday in DC. I always impressed by how
calm and orderly most demonstrations and rallys are here. And how
nice the police are, and how protected they make one feel. it is
really different from the demonstrations here in in the late 60's
early 70's.
Snail Scott on thu 18 apr 02
At 03:02 PM 4/16/02 -0400, you wrote:
>What about using the silver version of the platnium that Carla used
>on the base of her cup for the clayart exchange. I don't remember
>what it is called, but it is...overglaze...
Overglaze lusters are nice, but they look quite
different from actual metal, (like PMC,) so it
all depends on the effect you want. By the way,
neither one is microwave-safe, though there's a
gold overglaze luster which claims to be.
-Snail
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