Picture Marble Magnets 5
Next, take the glue gun and put it on low heat. Now that the glue on the pictures has dried to the marble, it is safe to hot-glue magnets to the back to make them into refrigerator magnets. Just put a small dab of hot glue on the magnet, and press it to the back of the picture. If you put on a little too much glue, it's okay because nobody will see the back of the magnet anyway. I used 1/2" magnets for these.