One of the renowned quilters (gosh I cannot recall her name right now) said that she had a quilt sprayed with 505 for 4 years and it was still good. I like it better than Sullivan's - I can barely smell the chemicals of the 505. It handles nicely during the quilting process and the quilt feels soft after the wash. Larger quilts ARE A BUGGER to spray and get to lay smoothly. My setup leaves a bit to be desired so I have to reposition the layers from time to time until I get everything right.