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Polymer clays are man made modeling materials that, once heat cured, become permanent and will not return to their original state. All are composed of the same basic components: plasticizers, resins, fillers and colorants.
Before using Polymer clay it must be conditioned... kneading by hand until the clay is soft and pliable or fold and roll through a pasta machine. Inadequate conditioning will result in weakened finished items and weakened piece to piece adhesion. Condition light colors first, then move to darker colors.
Polymer clay pieces can be cured in a standard oven (convection) or toaster oven. Do not microwave polymer clay. If you don't have a dedicated oven, place items in an aluminum pan, then cover tightly with foil to prevent residue build up in your oven. Cure pieces in a well ventilated area. Check oven accuracy with a thermometer and use a timer to avoid exceeding curing time.
The recommended curing temperature is 300 F (150 C). Kato Polyclay can be cured at 275 F (135 C) with good results and has been approved to cure at 350 F by our toxicologist, however caution should be taken when curing at that temperature, time should be limited to 10 minutes as you will run the risk of discoloration. You should never exceed 365 F. In prior laboratory testing, it has been determined that tensile strength increases at elevated temperatures.
When making large items, cover armature material, such as compressed foil, with clay. Clay walls should not exceed 1" thick. Do not use styrofoam as an armature material.
Materials that will withstand clay curing temperatures, such as glass, paper mache, wood, metal and ceramic items may be covered with clay and baked in the oven. Items may be nested in polyester batting to avoid flat, shiny spots.
Finished pieces may be painted or glazed after curing. Water-based paints and glazes are recommended. Cured clay may also be wet sanded (automotive sandpaper - 400 and 600 grit, in water) and then buffed to a high gloss sheen.Kato
Polyclay is intended for decorative use only - not for food bearing items.
Tools used for clay should be dedicated to clay use only. Clean hands
with alcohol saturated paper toweling or alcohol towelettes, then finish
with soap and water. Always clean hands before eating. Store clay in cool,
dry place away from direct sunlight. Wrap unused clay in plastic wrap.
Kato Polyclay is certified AP Non toxic and conforms to ASTM D 4236.