Anne Doyle on thu 11 jan 07
Another newbie question ...
I have been following advice garnered from various sources on using
plastic trays for slumpmolds. I am using various clays for these trays.
I have been using a very thin coat of vaseline to keep the clay from
sticking to the trays.
My question is: What do i do to get rid of the vaseline now that i've
unmolded the tray?
I don't know if this is a factor but will the vaseline soak into the clay
and make it hard to glaze?
I fire to cone 6 electric.
Thanx!
Anne
in Saint-Sauveur where as winter returns i wish more and more that i could
afford the trip to Louisville if only to escape it for a few days...
Sue Roessel Dura on fri 12 jan 07
On Thu, 11 Jan 2007 10:32:23 -0500, you wrote:
>I have been following advice garnered from various sources on using
>plastic trays for slumpmolds. I am using various clays for these trays.
>I have been using a very thin coat of vaseline to keep the clay from
>sticking to the trays.
>My question is: What do i do to get rid of the vaseline now that i've
>unmolded the tray?
If you bisque fire, the vaseline will burn off. WD40 works well too and =
I think
is less messy. Best, Sue
Snail Scott on fri 12 jan 07
At 10:32 AM 1/11/2007 -0500, you wrote:
>...I have been using a very thin coat of vaseline to keep the clay from
>sticking to the trays....will the vaseline soak into the clay
>and make it hard to glaze?
Only if you glaze greenware for
one-shot firings. If you bisque
first, it will all burn off.
Powdered dry clay dusted onto the
surface of a nonporous mold will
also help release the clay, with
no involvement of slimy vaseline.
-Snail
Kathi LeSueur on fri 12 jan 07
Anne Doyle wrote:
>Another newbie question ...
>I have been following advice garnered from various sources on using
>plastic trays for slumpmolds. I am using various clays for these trays.
>I have been using a very thin coat of vaseline to keep the clay from
>sticking to the trays.
>My question is: What do i do to get rid of the vaseline now that i've
>unmolded the tray?>>
>
Rather than using vaseline try using cornstarch which will burn off in
firing. To do this put some cornstarch in an old sock. Use the sock to
dust cornstarch on the slab, not the form. Then lay the slab in the
form with cornstarch side to the form. I only use hump molds and this
technique works every time.
Kathi
>I
>
Susan Fox Hirschmann on fri 12 jan 07
In a message dated 1/12/2007 10:55:40 AM Eastern Standard Time,
srdura@HIWAAY.NET writes:
WD40 works well too and I think
is less messy.
Yes, and there is also "mold release" spray, that you can buy from low fire
ceramic supply shops. I have also used a very thin coating of alumina hydrate
on the forms, and the clay releases easily from that as well.
Best of Luck!
Susan
Annandale, VA
Don Goodrich on fri 12 jan 07
Anne,
There are alternatives.
Assuming that a release agent is needed and the clay doesn't
come loose as it dries, you might try other release agents.
The aerosol vegetable oils used for cookware work pretty
well, and may come off of your greenware more easily than vaseline.
Have you tried lining your slump molds with anything else?
Soft paper, like paper towels, may be a good alternative. Although
it may wrinkle a bit, it'll peel off and the marks it leaves
on your clay can be smoothed over pretty easily. Fine linen or silk
should work too, if you don't mind giving an old scarf a new career.
Unless you're single firing, the oil or vaseline (or any
paper remnants) should not be a problem since it will burn out
in the bisque. Even firing to only 1000=B0F would eliminate these.
There should be no problem glazing afterwards.
If you are single-firing, consider making plaster or bisque
slump molds so you don't need to coat them with anything. The clay
should release without any help. You might also look for some teflon-
coated trays in the shapes you need. These tend not to stick to
clay nearly as much as plastic or metal surfaces do, and may be
sufficient for your needs.
Good luck,
Don Goodrich in chilly Zion, Illinois
>I have been using a very thin coat of vaseline to keep the clay from
>sticking to the trays.
***
>I don't know if this is a factor but will the vaseline soak into the clay
>and make it hard to glaze?
Dannon Rhudy on fri 12 jan 07
The vaseline will burn out when you bisque the
pieces. An alternative to the vaseline is something
like Pam; it releases easily and is not so messy.
regards
Dannon Rhudy
Anne Doyle on fri 12 jan 07
Thankyou for all the helpful suggestions!
I will try them all and see which one works best for my purposes... i just
happen to have on hand cornstarch, PAM and WD40 plus a load of silk
scarves from my grandmother that i couldn't bear to throw away... i bet
she'd be happy to see them aiding in the creative process!
Thanx a bunch!
Anne
Jeanne on fri 12 jan 07
Anne Doyle wrote:
> Another newbie question ...
> I have been following advice garnered from various sources on using
> plastic trays for slumpmolds. I am using various clays for these trays.
> I have been using a very thin coat of vaseline to keep the clay from
> sticking to the trays.
> My question is: What do i do to get rid of the vaseline now that i've
> unmolded the tray?
> I don't know if this is a factor but will the vaseline soak into the clay
> and make it hard to glaze?
> I fire to cone 6 electric.
> Thanx!
> Anne
>
>
Anne, the vaseline should burn out in your bisque fire. An alternative
to use instead of vaseline is WD-40, works great.
Jeanne
Sitka, AK
Gayle Bair on fri 12 jan 07
I've had great success with dusting cornstarch on my bisque and plaster
molds.
Gayle Bair
Bainbridge Island, WA
Tucson, AZ
www.claybair.com
-----Original Message-----
From: Don GoodrichAnne,
There are alternatives.
Assuming that a release agent is needed and the clay doesn't
come loose as it dries, you might try other release agents.
The aerosol vegetable oils used for cookware work pretty
well, and may come off of your greenware more easily than vaseline.
snip>
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