Metal clay requires the proper consistency before working with it. When fresh, or in humid climates, let the clay dry out just a little bit before working with it so that it doesn't stick to tools. However, in a dryer climate, moisture may need to be added to the clay beforehand.
Place the clay onto a double-layer of plastic cling wrap. Apply a dab of water to your fingertip then apply the water onto the clay. This allows more control of the application of water to the clay.
If possible, avoid using a spray bottle to apply water as this may add too much water and turn the clay to mud
Work the clay between a double-layer of plastic wrap as a single layer may be prone to tearing
Avoid touching the clay with bare hands as much as possible
Begin to work the clay between the plastic wrap by folding it over on itself. Press the clay between your fingers (with the plastic wrap as a barrier) to distribute the dab of water.
Open up the plastic wrap then fold the clay over itself again in a different direction. Repeat the folding process a couple of times until the clay is consistent throughout.
If the clay is still too dry, add another dab of water using your fingertips then repeat Steps 2 until the desired consistency is achieved.
When finished, twist the plastic wrap closed around any unused clay then place into a zip-lock bag. Metal clay stored this way can keep its consistency for several days or even weeks!
Tip: Wrap the clay with a damp paper towel to extend the working time of the clay.
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