603 Red Bottom Line Polyester Thread is a classic bright red in Superior Threads' ultra-fine 60-weight Bottom Line line — providing the finest possible red stitching for competition quilts on red backgrounds, invisible bobbin use under red top threads, and any application where maximum thread fineness with a vivid red color is needed.
Q: What is Bottom Line?
A: Superior's 60-weight filament polyester — the finest thread in their lineup. Originally designed as a premium bobbin thread, also used as top thread when the smallest possible stitch holes are required.
Q: What shade is 603 Red?
A: A bright, clean red — classic red without heavy orange or dark undertones.
Q: When should I use Red Bottom Line instead of Red Glide or Omni?
A: When maximum thread fineness is the priority — for competition quilts on red fabric, or bobbin use under red Glide on top. Bottom Line creates significantly smaller stitch holes than 40-weight thread.
Q: What weight is Bottom Line?
A: 60-weight filament polyester. Requires significant tension adjustment. Always test before production use.
Q: Is Bottom Line lint-free?
A: Yes — completely lint-free filament polyester.
Q: Is Red Bottom Line good in the bobbin under red Glide on top?
A: Yes — one of the most effective uses of Bottom Line for color-matched front-to-back stitching on red-backed quilts.
Q: Is 603 Red Bottom Line compatible with all longarm machines?
A: Yes — with proper 60-weight tension setup.
Q: Is 603 Red Bottom Line in stock at Linda's?
A: Check the current product listing for live availability.
The finest red stitch — shop 603 Red Bottom Line at Linda's Electric Quilters.
