they mean a banner with cut vinyl applied to it.what do you mean by cut? You cut the banner out? Is it a scrim banner? if it is, I wouldn't guarantee it at all. If it is not being used as the intent, I wouldn't guarantee it at all.
banners are temporary signage and should be treated as such. i give no warranty on banners.
Customer walks into your shop wants a banner you quote 50.00 100.00 whatever. What do you tell them about your banner you have sold them ? Or let's say they return 1 month later the vinyl not held up
What do you tell them ? That is the real question.