A step up from the adhesives of yore. These products are an attempt to mitigate a fly fisher's impact on the environment.

Both products are effective as they were designed to cement the head of a newly tied (or even old) fly and apply the product. When I went to tie up a few flies yesterday, my old head cement (two to three years old) and applicators (two of them) both were unusable due to hardening. The head cement will harden in both the bottle and the applicator, especially, so I only put a few drops in the squeeze applicator at a time, then squeeze out that amount for each fly I plan to tie, emptying the applicator so only air comes out when I’m done. I hope this will keep me in good shape for a year, or at least until I next have time to set up all the gear to tie up some flies.