Acrylic paintings on canvas are highly susceptible to water damage. If the paint is not protected, it will smudge and run when exposed to moisture. In some cases, the painting may even peel off of the art canvas.
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Acrylic paint, tempera paint and other types of paint that you might use on rocks cannot be sealed with hairspray. Hairspray is neither permanent nor waterproof and some formulations of hairspray and paint react badly to each other and could cause your paint to melt or get gooey!