To permanently harden clay, you need to use specific types like polymer clay (bake it) or air-dry clay (let it dry slowly or bake on low heat); traditional modeling/plasticine clay cannot be hardened, but you can seal cured clay with varnish or glue to protect it. The method depends on the clay type, with baking polymer clay making it ceramic-like, while air-dry clay hardens by water evaporation, needing slow drying or low-heat baking to prevent cracks.
Monster Clay® is a wax-based plastiline. It remains soft enough to be constantly remodelled and changed, and can be remelted and reused. It is not intended to make permanent items for display - rather used as a temporary material which can then be moulded and cast in something more durable later.
Air dry clay and polymer clay are fundamentally different. Air dry clay hardens through air exposure and doesn't require baking. Polymer clay, however, needs to be baked at specific temperatures to cure. Attempting to bake air dry clay can lead to cracking, burning, or loss of its unique properties.
Clay is not harmed by freezing, but it does affect its usabiliity and workability. The water in the clay is what freezes, and those water molecules form ice crystals and that disrupts the homegenous structure of all the platelets.
The acidity of the vinegar breaks down the clay a bit, and makes it sticky. Some artists use vinegar straight from the bottle, or add vinegar to clay instead of water to make a joining slip. All these methods work to create a join that is stronger than water or slip alone.
Yes, you do have to bake it. Polymer clay isn't an air dry clay and will only be fully cured when it's baked in an oven.
Even when dry, the air-dry clay remains prone to dents and scratches. To strengthen its surface, coat it with a few layers of primer. It works wonders forming a smooth and sturdy exterior. Unfortunately, most good-quality primers come in grey color, so it can be harder to paint the surface later.
But if you want to challenge yourself or you're set on firing without a kiln, here are three popular methods you can try.
Air-dry clay is typically softer and more pliable than traditional ceramics clay. This makes it easier to work with, especially for beginners or those working on small-scale projects. It can be shaped, sculpted, and molded using simple tools.
Drying Self-Hardening Clay
Boiling water cannot become hot enough to fully cure polymer clay.
For the uninitiated, most clays melt and turn to a mud or sludge consistency when heated. Monster Clay softens when mild heat is applied but will completely liquefy when heated to ~175F. You can find all the new Monster Clay Grades in the clay section of our webstore.
Bake for 30 minutes per quarter inch of thickness. It is suggested that thicker pieces be initially baked for 15 minutes, then another 5 minutes, another 5 minutes, etc. The clay needs at least 15 minutes to cure properly.
The bad news is that dry air dry clay has high porosity, similar to a sponge, with tiny holes that soak moisture. This porosity can make your creation soften, crack, or even crumble over time. Softie alert! The clay will absorb water, turning soft and potentially losing shape.
The "3 Pull Rule" in pottery is a guideline to limit upward wall-raising motions to about three times per piece, helping potters avoid overworking the clay, build stronger cylinders, and work more efficiently by focusing on compression rather than just pulling, with each pull building on the last to achieve height and shape. It's a method to develop control, ensuring the clay moves upward evenly and doesn't become soggy or weakened, though it's a flexible guideline, not a strict law.
Pit firing is also known as smoke firing and is a very traditional method of firing clay. For unglazed, natural looking pottery, this is a perfect method but it can also be used for glazing if needed. As the name suggests, pit firing takes place in a hole or pit.
Yes, you can fire pottery in your microwave! Learn how to do microwave Raku in this Primetime class on ClayShare. This class will cover the types of microwave you can use, the proper microwave kiln, clay, glaze and all of the tools and materials needed to do microwave Raku!
The best option to provide a water-resistant, durable seal on air dry clay objects is to use a polyurethane or acrylic sealer. These provide a durable, water-resistant finish to protect the air dry clay and prevent it from yellowing.
One way to seal air dry clay is by using a craft glue like Mod Podge or PVA Glue. This method is simple and easy, and all you need to do is brush a coat of the glue over the surface of your pieces. Plus it's non-toxic and once it dries, it will be sealed and give your creations a water resistant layer.
The clay gradually constricts as it dries, and the rigid piece remains the same size. This can result in the clay cracking.
A hairdryer or even microwave will NOT harden the clay. Polymer clay needs to be baked. Typically 250°F for 15 minutes for every 1/4" of thickness.
Once it is baked and cured, it's actually water resistant and pretty robust. If you want to achieve a particular. finish to your polymer, however, a varnish or acrylic sealer is the way to go. If you've painted on your polymer clay after baking, it will definitely need some sealing to protect it.