We learned a lesson on these banners.
Had a customer bring back a banner because the ink was worn on it. Turns out the ink was sticking to the hem that was folded in.
Now we keep the banners rolled out overnight or at least a few hours before we roll them print side in.
However we think the customer left the Banner in her car and the heat caused the ink to stick to the print side of the vinyl on the hem.
Granted it was a black background banner and heavy on ink and we don't remember if we let it sit or not, but our lesson is to let the customer know not to let the banner sit in the sun or hot car while rolled up.