When tying salt water flies on hooks, which are not fully stainless, it is a good idea to varnish them before putting on tying thread or material. Use clear nail polish in a thin layer applied with a brush. Varnish a handful of hooks at a time and let them dry before applying material.
The varnish protects the hook from the water seeping under the materials, and will even help the thread "bite" better, giving you a more durable fly.
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