I use 505 on all my quilts....wall hangings to queen size.
You have to be sure that your fabrics are 100% cotton, or it won't stick well.
I spray it half at a time, but Ricky Timms sprays his in quarters and I think I will try that next time.
I have a queen sized that I've been doing FMQ-ing on for almost a year and it is holding perfectly through all the handling. Great stuff.
Watson