Do I need to prime the surface before using acrylic paint?
Whether you need to prime before using acrylic paint depends on the surface you want to work on. As mentioned above, acrylic paint can be applied to virtually any surface, as long as it’s slightly absorbent and free of dirt and grease, including but not limited to paper, cardboard, universally prepared canvases and canvas boards, unprepared canvases, stone, wood, concrete and unglazed ceramics. To prevent thinner surfaces such as cardboard and wooden panels from warping, treat both sides with a primer (acrylic binder and/or gesso).
Acrylic paint will not adhere well to smooth surfaces such as glass or plastic. Because the paint does not adhere well, it is easy to peel or scratch off during transport or use. To make sure the paint can properly adhere to the surface you’re working on, it should be free of grease and dust and slightly absorbent. If the surface is too absorbent, use acrylic binder before adding gesso. If it’s not absorbent enough, you can just use gesso.