Marcia Selsor on mon 6 nov 06
I agree with what Ellen says.
I use ^ 2 terra cotta in my extruder. The WD40 has never shown a sign
of using it.
She said she didn't know how other clays reacted. My terra cotta
doesn't react. I also used some Standard Sculpture
clay at the Clay Studio in Phila. It didn't react to WD40 either.
The terra Cotta I use in Italy in the extruder there doesn
t react to the petroleum lubricant we are using there.
Marcia Selsor
http://marciaselsor.com
On Nov 5, 2006, at 11:17 PM, Ellen Currans wrote:
> Dear Chris,
>
> Your experience is obviously different than mine. I cannot speak
> to the use of WD40 with porcelain, but I know a lot of people who
> use it as I described. When I brush a very fine film of WD40 on a
> form and then lay the clay slab into the form, there is very little
> WD40 that gets onto the scrap clay. The clay piece I make doesn't
> even seem to absorb it. Turning it out the next morning I find a
> small amount of moisture of some kind in the form and on the clay,
> which I wipe off with kleenex. I have never had any kind of
> problem throwing feet or adding feet to the bottom of pieces made
> with WD40. Once dry, you could not tell what had been used, and
> after bisqueing it is definitely all gone.
>
> Likewise, I have never had the problem you suggest might happen
> with WD40 getting wedged into my clay and ruining the next pots.
> All my scrap is immediately put into plastic bags and repugged in a
> Venco. The amount of WD40 I use in one session with my extruder
> (to make square wall vases, or slugs for handle making) amounts to
> about 1 teaspoon. It gets repugged with at least l50 pounds of
> clay. Now, if you are working with very small amounts of clay and
> reclaiming by hand, and using WD40 each time you change the clay
> color, perhaps that might be a problem. If you spray it in until it
> is dripping out the bottom you are using too much. That said, I
> don't think cleaning an extruder is that big a problem. Leave it
> open and the clay will dry and come loose with a bit of whacking
> and scraping. I have to get on a stool to do that, so I find it is
> just simpler to keep it clean as I go.
>
> I use soft clay in my extruder and do not have a problem with my
> extruded forms separating. I think that is more a problem of too
> hard clay rather than WD40 resist.
>
> My experience is with Cone 10 stoneware fired in a gas kiln, and it
> is certainly possible that other clays, temps and methods may have
> problems I'm not aware of.
>
> Ellen Currans
> Dundee, Oregon
>
>
>
>
>
>
>
>
> Spray it or wipe it inside the barrel
> and you get the WD40 on four
> clay surfaces ... kind of forget
> about it and re-wedge it and use
> the clay about a week later ...
>
> ... that's the load of pots where you
> cannot figure out what went wrong
> since you did everything just the same
> as always ...
>
> The WD40 does not evaporate without
> a trace ... you got that stuff on and in
> your clay!
>
> Chris Campbell - in North Carolina - maybe I will
> spray some on my hands then wrap them in duct
> tape and see if my dry skin gets smooth!
> Please ... big grin and just kidding folks!
>
> Chris Campbell Pottery LLC
> 9417 Koupela Drive
> Raleigh NC 27615-2233
>
> Fine Colored Porcelain since 1989
>
> 1-800-652-1008
> Fax : 919-676-2062
> website: www.ccpottery.com
> wholesale : www.wholesalecrafts.com
>
Marcia Selsor
http://marciaselsor.com
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