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Also know, should you gesso paper?
When you apply gesso to paper, it will wrinkle and warp as the paper's fibers expand. If you use a heavy enough paper, it will flatten out nicely as it dries. But if the paper is too light, it will never dry completely flat. Paper heavier than 140 lb. is also good, but will likely cost more.
Hereof, do you need to gesso watercolor paper?
You don't have to gesso the entire surface of your paper. Watercolor “takes” to gesso differently than it does to paper, and you can take advantage of this by selectively applying gesso, leaving some parts of the paper untreated.
You can prime a canvas with acrylic mediums, clear gesso, or rabbit skin glue. If you work with acrylics, you can also paint directly on raw canvas without priming it first. Oil paints require a primer to protect the canvas from the linseed oil found in oil paints.