John Rodgers on sat 26 dec 09
Question: Is this mold to be used for slip casting or as a slump/hump mold.
Slip casting - you absolutely do not want to use any oily substance
such as Pam, vaseline or WD 40. These will ruin the absorption qualities
of the mold. Use instead tincture of green soap. It will not affect the
plaster in the mold - provided you don't use to much.
Slump/hump molding - vaseline, Pam, or whatever works. These things will
keep the clay from sticking anyway, so it doesn't matter.
John Rodgers
Chelsea, AL
mel jacobson wrote:
> Hi Mel,
>
> I have trolled through postings about plaster mold making, to find an
> answer to a question about using a plastic found object for my
> prototype.
>
> As someone who is not completely computer savvy, I can't work out how
> to jump in and join the conversation or post my question.
> Can you help???
>
> I am wanting to find out if I need to coat the surface of a plastic
> object before I pour plaster around it to make a one piece mold for
> slip casting; or if the plastic surface will automatically release.
> I would rather not risk possible destruction of my found object by
> experimenting; and my memory of long-ago casting workshops is not
> forthcoming with the advice I seek.
>
> Thanks in advance if you can help,
>
> Syma
> www.symastudios.com
>
>
> from: minnetonka, mn
> website: http://www.visi.com/~melpots/
> clayart link: http://www.visi.com/~melpots/clayart.html
> new book: http://www.21stcenturykilns.com
>
>
mel jacobson on sat 26 dec 09
Hi Mel,
I have trolled through postings about plaster mold making, to find an
answer to a question about using a plastic found object for my
prototype.
As someone who is not completely computer savvy, I can't work out how
to jump in and join the conversation or post my question.
Can you help???
I am wanting to find out if I need to coat the surface of a plastic
object before I pour plaster around it to make a one piece mold for
slip casting; or if the plastic surface will automatically release.
I would rather not risk possible destruction of my found object by
experimenting; and my memory of long-ago casting workshops is not
forthcoming with the advice I seek.
Thanks in advance if you can help,
Syma
www.symastudios.com
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html
new book: http://www.21stcenturykilns.com
Gwynneth Rixon on sat 26 dec 09
Hi=3D2C I would use a thin layer of soft soap/washing up liquid=3D2C being =
care=3D
ful not to leave brush marks or bubbles. Some plastics will release cleanly=
=3D
=3D2C it depends on the shape and type of plastic
Gwynneth
> Date: Sat=3D2C 26 Dec 2009 10:05:07 -0600
> From: melpots2@VISI.COM
> Subject: plaster question/new member
> To: Clayart@LSV.CERAMICS.ORG
>=3D20
> Hi Mel=3D2C
>=3D20
> I have trolled through postings about plaster mold making=3D2C to find an
> answer to a question about using a plastic found object for my
> prototype.
>=3D20
> As someone who is not completely computer savvy=3D2C I can't work out how
> to jump in and join the conversation or post my question.
> Can you help???
>=3D20
> I am wanting to find out if I need to coat the surface of a plastic
> object before I pour plaster around it to make a one piece mold for
> slip casting=3D3B or if the plastic surface will automatically release.
> I would rather not risk possible destruction of my found object by
> experimenting=3D3B and my memory of long-ago casting workshops is not
> forthcoming with the advice I seek.
>=3D20
> Thanks in advance if you can help=3D2C
>=3D20
> Syma
> www.symastudios.com
>=3D20
>=3D20
> from: minnetonka=3D2C mn
> website: http://www.visi.com/~melpots/
> clayart link: http://www.visi.com/~melpots/clayart.html
> new book: http://www.21stcenturykilns.com
=3D20
_________________________________________________________________
View your other email accounts from your Hotmail inbox. Add them now.
http://clk.atdmt.com/UKM/go/186394592/direct/01/=3D
steve graber on sat 26 dec 09
a lot of plastics contain mold release compounds which are part of their ba=
=3D
sic chemistry. =3DA0so unless you have weird features that otherwise trap t=
he=3D
plaster, or no draft angle features, you shouldn't need to add still anoth=
=3D
er mold release material to your plastic-master part.=3DA0 =3D0A=3D0Ai have=
done =3D
this on a small-limited scale=3DA0with thrift store found items i wanted to=
c=3D
opy a few times.=3DA0 =3D0A=3DA0Steve Graber, Graber's Pottery, Inc=3D0ACla=
remont, =3D
California USA=3D0AThe Steve Tool - for awesome texture on pots! =3D0Awww.g=
rabe=3D
rspottery.com steve@graberspottery.com =3D0A=3D0A=3D0AOn Laguna Clay's webs=
ite=3D0A=3D
http://www.lagunaclay.com/blogs/ =3D0A=3D0A=3D0A=3D0A----- Original Message=
----=3D0A=3D
> From: mel jacobson =3D0A> To: Clayart@LSV.CERAMICS.ORG=
=3D
=3D0A> Sent: Sat, December 26, 2009 8:05:07 AM=3D0A> Subject: plaster quest=
ion/=3D
new member=3D0A> =3D0A> Hi Mel,=3D0A> =3D0A> I have trolled through posting=
s about =3D
plaster mold making, to find an=3D0A> answer to a question about using a pl=
as=3D
tic found object for my=3D0A> prototype.=3D0A> =3D0A> As someone who is not=
compl=3D
etely computer savvy, I can't work out how=3D0A> to jump in and join the co=
nv=3D
ersation or post my question.=3D0A> Can you help???=3D0A> =3D0A> I am wanti=
ng to =3D
find out if I need to coat the surface of a plastic=3D0A> object before I p=
ou=3D
r plaster around it to make a one piece mold for=3D0A> slip casting; or if =
th=3D
e plastic surface will automatically release.=3D0A> I would rather not risk=
p=3D
ossible destruction of my found object by=3D0A> experimenting; and my memor=
y =3D
of long-ago casting workshops is not=3D0A> forthcoming with the advice I se=
ek=3D
..=3D0A> =3D0A> Thanks in advance if you can help,=3D0A> =3D0A> Syma=3D0A> =
www.symastu=3D
dios.com=3D0A> =3D0A> =3D0A> from: minnetonka, mn=3D0A> website: http://www=
.visi.co=3D
m/~melpots/=3D0A> clayart link:=3DA0 http://www.visi.com/~melpots/clayart.h=
tml=3D
=3D0A> new book: http://www.21stcenturykilns.com=3D0A=3D0A=3D0A=3D0A
Lis Allison on sat 26 dec 09
On Saturday 26 December 2009, Gwynneth Rixon wrote:
> Hi, I would use a thin layer of soft soap/washing up liquid, being
> careful not to leave brush marks or bubbles. Some plastics will release
> cleanly, it depends on the shape and type of plastic Gwynneth
Spray veg oil like PAM also works well. A quick spray, then gently wipe
off any excess.
You know you can test it by making a tiny amount of plaster, say 1/4 cup,
letting it set up a bit and then blupping it onto the plastic model. Once
set, you can see how easily and cleanly it pops off and you'll know what
to do.
Lis
--
Elisabeth Allison
Pine Ridge Studio
www.Pine-Ridge-Studio.blogspot.com
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