Paper wrinkles when painted with watercolor?

You have to buy watercolor paper, you cant paint on just any paper, then if you wet it before, and then tape it to a board, it will stand the moist better, most of the time you will find the paper does warp. it Warps, bends, it doesn't wrinkle, you can also staple it to a stretcher, in the end, learn to live with a little bending, and once you mat it and frame it, it will look good. all you can do is..Experiment, and learn by trial and error. watercolor is a wonderful medium, it is fast and colorful.