I use it on my queen size quilts. Don't use pins anymore, not need to with the 505 spray. I do use helpers to spray baste my quilts. I have taught my husband and my son's girlfriend and they have even spray basted about 6 of them with me just sitting on the side giving them encouragement. I am fortunate that DH is a pastor and the church is almost across the street and we can go over there whenever the room's not being used and have a large floor surface to work on as well as push together long tables so we don't have to get down on the floor.
I have not had problems with the 505 gunking up at the nozzle. I have had others do that. I seriously can't remember what I used to un-gunk in the past.