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Ed McCormick
Joined:
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21-Mar-2004
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Started On : 30-Dec-2006 at 10:00:03 AM, #Views : 5986
Topic Subject : RE: A new topic has been added-How to avoid Dimples in alginate? |
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The real question that needs to be answered is what causes mold dimples?
It is the deformation of your mold - but what causes deformation? Two causes
are the usual culprit. The first is from pressure points created by uneven
distribution in the use of fiber technique. Lumpy fiber will cause the mold
to push up into itself. The resulting casting will show unsightly
depressions.
A second cause is failed shell mold. Where there are gaps between the shell
and the alginate, your casting material will push into to them creating
bumps in the final casting.
The first could be the uneven distribution of the cotton fiber added to the
alginate surface when using that technique to bond alginate to your shell.
Use a misting of Algislo on the alginate surface to delay the surface from
setting. In that way you don't need to rush. Cut a six-inch square of
cotton. Then pull the cotton square in half to expose the middle - the
softest and fluffiest part of the cotton. Then simply dab the cotton to the
alginate surface. The wet alginate should pull off fibers -- enough to do
the trick when the alginate sets without lumping up.
If you use another technique make certain to pull off the excess fibers
before you add the shell. Lumps of cotton will cause mold dimples.
The second cause for mold dimples (bumps in this case) is from an improperly
applied shell mold. In the case of plaster bandages the first layer must be
absolutely flat against the surface -- no air bubbles. If you are using the
cheesecloth and plaster method you must use your hands across the surface to
feel for any air gaps.
I hope that helps.
-----Original Message-----
From: aliforum@lifecasting.org [mailto:aliforum@lifecasting.org] Sent:
Saturday, December 30, 2006 9:00 AM
To: info@artmolds.com
Subject: A new topic has been added-How to avoid Dimples in alginate?(
Message No. 1321)
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Hello Ed McCormick
Post Date : Saturday 30th of December 2006 09:00:11 AM
Posted by : "Ray Hope" ray@bimmortal.com
How to avoid Dimples in alginate?:--
We have done two recent casts with both mold gel slow set and fibre gel, and
have noticed quite a lot of dimples in the finishes casts. I think they are
caused by the alginate bing pushed into the model as it sets.
We are using the process demonstrated by Dave in the casting the female
torso DVD. (ie alginate, then cotton wool, then brush on dental plaster with
cheese cloth.
I have an idea about which part of the process is causing it but wanted to
ask the opinion of all those that have been doing this for far longer than
us.
So who can tell me what is causing it and how to avoid it?
thanks
Ray & Rada
B Immortal Body Casting
http://www.bimmortal.com
ALI is an international organization whose members are engaged in the art
and creative industries. Its purpose is to promote the art of life casting
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