TroutLine Gel-Spun Ultra Flat -a GSP (Gel Spun Polyethylene) Thread

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GSP thread made its debut in the fly tying scene in the latter part of the 20th century. Developed from polyethylene fibers, this thread gained prominence due to its remarkable strength-to-diameter ratio. Initially used in other industries for its strength and durability, it quickly found its way into the hands of fly tiers seeking a thread that could handle the demands of modern fly patterns.

Troutline’s Gel-Spun Ultra Flat thread is a nothing then non twisted Gel Spun Polyethylene (GSP) thread. Unlike traditional twisted threads this type have parallel fibers, a key characteristic that distinguishes them.

Advantages of Gel-Spun Ultra Flat:

  1. Perfectly Flat Bodies: The parallel alignment of fibers allows this thread to sit flawlessly on the hook shank, forming impeccably flat bodies. This is a crucial advantage, especially when tying nymphs and dry flies that demand a streamlined appearance.
  2. Ease of Splitting: Fly tying often involves intricate techniques, and the Gel-Spun Ultra Flat thread excels in this regard. Its structure makes it exceptionally easy to split, offering versatility for various tying methods.
  3. Exceptional Strength: One of the standout features of GSP threads is their unparalleled strength. The Gel-Spun Ultra Flat thread inherits this robustness, providing fly tiers with confidence in its durability and resistance to breakage.
  4. Low Stretch: this type of thread exhibits minimal elasticity, providing enhanced sensitivity. This feature is particularly advantageous when tying nymphs and streamers.
  5. Durability: Known for its durability, GSP thread resists fraying and breaking, ensuring the longevity of tied flies

Disadvantages and Solutions:

  1. Smooth Texture: While the smooth texture aids in reducing bulk, some fly tiers find it a bit slippery when applying certain tying techniques. However, this challenge is easily mitigated with the use of wax.
  2. Limited Color Options: The Gel Spun Ultra Flat thread like all GSP threads is commonly available in black and white, limiting the color choices for fly patterns. Fly tiers often resort to using permanent markers to add color as needed.
  3. While the Gel-Spun Ultra Flat thread presents numerous advantages, fly tiers should be mindful of a unique challenge: When mounting the bobbin on the support, it’s crucial to ensure that all the thread has passed through the tube of the bobbin holder. This precaution is necessary to prevent a thin fiber from remaining attached to the spool due to electrostatic charge. Over time, this could lead to thread blocking. Awareness of this aspect ensures a smooth and uninterrupted tying experience.

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