Do not fold back material ink to ink. If you do the ink could stick to itself and ruin your print!
Try to roll your banners back up always. And fold your billboard back not allowing ink to ink contact.
Store banner in a dry cool place.
Do not store in a hot place, do not store directly exposed to the sun.
If you take a banner or billboard out of storage and it has creases in it that is no problem.
Getting creases out of your vinyl banner is easy. Simply lay the banner out flat in the sun for about 30 minutes and then pull the edges taught. As the material heats up it becomes more pliable. You will notice that the creases will disappear over time. You can also use a hair dryer or heat gun to warm up the material to achieve the same results.