The PMC brand clay package has a lock closure that keeps the package tightly sealed. However, this isn't enough to keep the plastic-wrapped clay from drying out over time.
A great way to store your opened clay is to use a Clay Vault. It comes with small moisture absorbing crystals (polymer gel) that, when exposed to water, expand to more than ten times their volume, holding the water inside them. They are also non-toxic. As they dry out they shrink back down in size. They last for a year or more before they decompose. These crystals can also be added directly to the PMC package to keep clay moist.
Another option is to purchase water beads found in the floral department in stores. A small 10g package costs less than $2 and lasts for years. I have yet to use up the package I bought three years ago.
Of course, when storing the clay in one of the above containers, it's best to wrap it in plastic wrap. I learned a great tip about cutting the plastic wrap into smaller usable sizes from Lorrene Baum-Davis.
Take the roll of plastic wrap out of the box. Using a razor knife, cut a slit down the roll's length through all layers, then make a cut in the center around the plastic roll. Now, when you remove a piece of plastic wrap, it's already cut into small rectangles!
Until next time, have fun claying around!
by Janet Alexander