Watercolor on yupo 'paper' is an exciting exercise in unpredictability.  Yupo is made from recyclable polypropylene and don't act at all like paper. The paint can be moved around on this surface and since it isn't absorbed, can even be wiped away before it dries.

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Gouache paint gives a result that is similar to watercolor, but more opaque.  It is a good medium to use in a study on paper before a larger oil or acrylic painting is attempted.