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This page offers suggestions
to prevent clay from
sticking. You probably don't need to read this section
unless you are experiencing this specific problem.
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What causes clay to stick to the molds? |
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The resin Push Molds were specifically developed to release clay easily. Even so, there are several factors that can cause clay to stick, and different solutions depending on the reasons. Causes include clay residue, too little cornstarch, soft clay, and warm temperatures, all of which are discussed below. It is suggested that you read the main FAQ first for general tips on using the molds. Following those methods should prevent any problems. Return here after you have followed those directions and are still experiencing sticking. |
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What is "clay residue" and how do you remove it? |
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After repeated use or when too little cornstarch is used, the molds
can develop a sticky residue of plasticizer from the clay. When molding
a dark-colored clay, sometimes you can see the residual color left in
the mold. With light clays it is harder to detect the residue, but it's
often there. Molds can be cleaned with waterless hand cleaner or rubbing
alcohol and a soft toothbrush. Make sure the mold is thoroughly dry
before using it again.
Firm clay should release well from a clean mold. When the clay starts sticking, it is a signal that it is time to clean the mold. |
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How much cornstarch should you use? |
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It is hard to use too much cornstarch. Do a few tests using more cornstarch than you think you will need. After you have good samples, cut back on the cornstarch until you find the amount that works best for you. Use a clean, soft brush to remove any excess cornstarch from molded pieces. Or, rinse them under running water and allow them to air dry before baking. The water will dissolve the cornstarch but will not affect the clay. Another technique is to form the clay into the appropriate shape prior to molding and then to dust both the mold and the clay with cornstarch. Mold as usual. Instead of cornstarch, you can try Marie Segal's favorite release agent, Armor All® protectant (sold with auto supplies). |
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What is the best way to handle softer clays? |
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Mushy or sticky clay can be leached to remove excess
plasticizer before molding. Roll the clay into a thin sheet and place
it between sheets of clean typing paper with a heavy book on top. To
prevent damaging any surfaces, stack it like this: aluminum foil, typing
paper, clay, typing paper, aluminum foil, book. Overnight should be
long enough. The longer you leave it, the more plasticizer leaches out
of the clay and is absorbed by the paper.
Firmer clays such as Fimo mold well. If you add Mix Quick or any other conditioner to Fimo, use it sparingly. In general, no more than one part Mix Quick should be required for four (or more) parts of clay. |
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What is the best way to handle clay on warm days? |
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More problems with sticking occur on hot, humid days during the summer months. The simplest solution is to pop the filled mold into the freezer for a few minutes to make the clay firmer and more easily removed. Warm hands will also contribute to sticky clay. You can store softer clays in the refrigerator and handle them lightly during shaping so that they remain cool and firm. |
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How do you solve sticking in larger impression areas? |
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Sometimes sticking problems arise in only one or two impression areas of a mold, usually the larger or deeper areas. One solution is to mold that area in two steps. First, only partially mold the clay and remove it. Dust both the mold and the partly molded clay again with cornstarch. Carefully align the clay and press it fully into the mold to finish. |
