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We recommend that you use your face paints within 12 months of opening.
Being that the paints are water based, you'll be using water on your brushes and sponges to apply it.
When on skin the paint dries within a minute (depending on thickness of the layer).
If you do not rub it, it will stay for 12 hrs until you wash it off under normal circumstances. However, we do not have any specific experience for long time use.
Yes, you can get new shades if mix colors.
Yes, it is lead-free, nontoxic, and paraben free.