Finished polymer clay items are actually pretty sturdy,
especially when it is a solid object, but that does not mean
there is no care involved. Thicker/solid items (beads,
statues, etc) are easier to care for. Thinner items
(hollow edge of 3D flower petals, any small or thin item)
require more careful handling so as not to break them.
But since most people treat their art with care,
I would hope you would know this already *smile*.
1) Keep away from temperatures over 85 degrees.
2) Keep out of direct sunlight. Colors can fade over time.
3) Keep away from any oil-based product. Mineral oils
(often used in hand lotion and other beauty products),
petroleum based products (Vaseline, and other products),
and other similar type oils (cooking oils?)
4) Keep away from propellants. Hairspray, perfume, and any other things you spray.
5) Do not use with food. A polymer bowl (or any clay product)
should not have food in it, on it, or around it, unless there is
something else used as a liner (plastic, glass, metal, even paper).
6) Wash with lukewarm water and a mild soap, if needed (like Ivory dish soap).
Now, all of that does not mean that you can not enjoy a polymer creation!
If you wear a necklace with polymer clay beads, for instance, just be sure
to put it on after you use the hairspray and perfume! If you take care
of your polymer items, they will last a VERY long time. Just treat with care,
as you would your other fine jewelry, sculptures, etc., and you will do fine!