Cold porcelain when dry is slightly flexible and quite durable if it’s sealed with a waterproof sealer, this makes it perfect for thin, delicate creations that would be fragile if made from other materials. Cold porcelain will be damaged or even dissolve if it’s exposed to water without being properly sealed.

Another distinctive different between cold porcelain and other air dry clay is the hardness and durability when dried. Cold Porcelain gets very hard when dried. So hard it’s as if it was fired in a kiln. Cold porcelain can also be made into thin pieces without breaking.

The mixture is sticky because it was under cooked. You could add more cornstarch but even if you put it in the microwave for short bursts of time you should have got the right consistency. The clay should not be sticky at all. It should not stick to your fingers when you knead it at all.

So what exactly do I seal cold porcelain with? A. You can seal it with any Clear Acrylic Sealer spray lacquer or Sculpey sealers which you dip into. Krylon (brand) has many different sealers from glossy, satin to matte.

A few reasons why your clays cracks when it dries: Most often times moisture evaporating from the clay is the reason for small cracks. This is an obvious issue if you are using AIR DRY clay and the air is the thing that slowly will make cracks. Be sure to store your air dry clay in an air tight container.

Cracking is mainly caused by uneven drying of the piece, meaning that some parts of the pottery shrink more than others. The key to avoiding these pitfalls is to create a consistent environment for drying the piece and undertaking the necessary preparation to ensure that the entire piece dries at a similar rate.

Even some oven-safe ceramics can only handle a certain heat level, which poses the question “at what temperature does ceramic crack?” While many ceramics can handle temperatures up to 3,000 degrees F, they can be sensitive to a quick change in temperature.