I've spoken with a couple long armers and they said if it's what the customer wants them to use then they do. Most customers ask the longarmers first. Also depends on the thread count.
Originally Posted by
craftyheart2
I have never used a sheet on the outside layers of my quilt but I resorted to using them for the foundation for my string blocks after the person I send my charity tops to complained about the muslin I used not being liked by her machine. I am not sure I would send a sheet to a longarmer for a backing but I would probably have a go at using one on a quilt I was finishing on my domestic machine if the colour was what I wanted.