I usually spray baste and never considered once I was told by Patsy Thompson that she's had quilts basted for several years (505), folded and quilted later with no problems. I've not heard anything about the newer basting system I've seen Alex Anderson use. I also was taught to SITD to stabalize first before quilting. I don't necessarilly do every seam but at a minimum of quartering the quilt. I have one that has long been pinned. I'm almost ready to tackle this one (king size) so I'll leave some of the pins in after I SITD. Seems logical advice. LOL I've left many love stains in my daughter's dresses from pinning. LOL I never pin now, piecing or garment sewing, the Pfaff IDF is a wonder.