would this work on a kids potters wheel

No. Polymer clays are for hand-building only. They are too solid for potters wheels. You'll want a nice air dry clay. Even then you'll need to wet it down somewhat so its pliable enough to shape on the wheel. Good luck & have fun!

To work on the clay over time do I keep it moist some how? How long does it stay moist?

Polymer clay (including the Super Sculpeys) are oil-based rather than water-based like the many air-dry clays many are familiar with. Since polymer clay contains no water, it can't "dry" out. Over time it can become less supple though IF some of the oils have gotten leached out by being in direct contact with porous materials, by being in a place that's too warm or has too much UV light (which will begin to cure it), or if the ingredients have begun to "settle". It can always be resoftened by mixing in more oily stuff, or by warming it in various ways (including stretching it by kneading or in a pasta machine or food processor, etc, which create heat from friction), and can even be reconstituted if partly cured tho sometimes not worth the trouble. It will also be warmed from just handling or the heat of hands. For longer storage, it can be helpful to put it in a cool, dark place to avoid those situations, and an air-tight container like a plastic bag or Tupperware can help at least a bit too for some things.

How long would I have to work with this clay after kneading...before it becomes firm again?

Super Sculpey always stays somewhat firm. When you knead it. It warms slightly becoming slightly more pliable but still pretty much holds its shape. As it sits it returns to room temperature becoming a little less pliable but doesn't harden. How quickly that happens depends on the temperature in the room. You can hasten this by placing in a cooler area (but be forewarned if you put it in the fridge the condensation that will form when you remove it could cause the clay to "moon" once baked. If you leave the unbaked piece for years it will eventually fracture but once worked with the hands the oils are redistributed throughout the clay & it becomes pliable again. (Think of it a bit like gum. Never gets as hard as Hubba Bubba - but relaxes a bit once you work with it.)

Brand	Super Sculpey
Colour	Gray
Age Range (Description)	Adult
Material	Clay
Item Weight	0.45 Kilograms
Number of Items	1
Recommended Uses For Product	Modeling
Special Feature	Oven Bake
Included Components	Tools
Educational Objective	Creative Skill
Model Name	Super Sculpey Firm Clay: Gray - 1 lb
Item dimensions L x W x H	14.9 x 7.6 x 3.8 Centimeters
UPC	553002682700 046909693165 799457394595 712353341845 046978197939 715891114513 791836790660 046979593471 787162964301
Global Trade Identification Number	00715891114513
Language:	English
Model Number	SS1SCULPT
Number of Puzzle Pieces	1
Assembly Required	No
Batteries Required	No
Batteries Included	No
Material Type(s)	Clay
Material Care Instructions	do not microwave
Remote Control Included?	No
Product Dimensions	14.94 x 7.62 x 3.81 cm; 450 g
Batteries	1 12V batteries required.
Item model number	SS1SCULPT
Manufacturer recommended age	14 years and up
Manufacturer	Sculpey
Item Weight	450 g

Super sculpey Firm

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