The WD-40 is a proven midge pattern and small mayfly pattern. Typically consisting of only two materials—dyed mallard flank and dubbing—it’s a relatively simple fly to tie. It is, however, quite small and takes a bit of practice to manipulate the materials on a small hook.

WD-40
The WD-40 is a beginner-to-intermediate level fly tying pattern. It is a standard midge pupa imitation. The colors can be varied based on the specific midges you're targeting.
Equipment
Materials
- Hook: Size 18-24; TMC 2487
- Thread: UTC 70 Denier
- Tail: Dyed mallard flank
- Body: Tying thread
- Thorax: frog hair dubbing
- Wingcase: Dyed mallard flank
Instructions
- Set up your fly tying vise
- Fix the hook in the vise's jaw
- Push play on the video tutorial