How to make protest signs quickly and on the cheap

How to make protest signs quickly and on the cheap

Materials (to make 100 signs): * Posterboard, 22″ x 28″ (to be cut down to 22″ x 17″) – $30 for 100 * Spray adhesive (or wheat paste) – $10 * Paintbrushes – $5 * Blue paint (watered down so it is very light when applied; about 1 tbsp of