How do you stop cardboard from bending while painting it preferbly something for an oddyessy of the mind prop that should stay straiaght?

Answer 1

To prevent cardboard from bending while painting, you can first reinforce it with a layer of thin wood or foam board glued to the back. Additionally, painting with lighter coats and using acrylic paints can minimize moisture absorption, which often causes warping. Lastly, consider applying a clear sealant to protect the surface once the paint is dry, helping maintain its shape.