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I have used a bfk on a charter with a fouled prop and, yes, the dainty devices would have been useless, but the BFK was supplied by the charter and I got a free trip for my effort. Thanks Dennis @ Silent World.
If you are wrapped up in almost invisible mono-filament are you REALLY happy to see a stranger coming at you with a BFK?
I use a Spyderco Pacific Salt 2 folding knife and a Spyderco Autonomy; both with blades made from H-1 and they require no special sharpener other than what you would use on a similar knife made from other steel. It does require more sharpening than a harder steel but it takes a fairy keen edge. I work in and around the ocean using the Autonomy while diving and the Pacific Salt on the surface. They definitely do not rust, but I do rinse them regularly in fresh water.
Everyone has their favorites. For fixed blades I will stick with my UDT knife the Scubapro that has served well for many years or my custom made Shane Sibert knife shown in the second picture that I posted. I also dive a Randall model 16 sometimes. Getting value when purchasing a tool is rarely at the top of my list of requirements.
How often are all of you actually using your cutting devices to get them dull?I
Surely they don't get dull if not being used?
I have a titanium knife that I have for many years and it's still as sharp as when I got it. However, it doesn't get any use. It just accompany me on my dives.
Have a stainless steel shear as well. I've never needed to use it under water either, though I have cut a couple of straps and bungee with it. It's very effective. I spray it down with wd-40 after most dive. It retains a coating that seems to last a few dives.
Have a ceramic line cutter for backup.
I work as a diver and work on two surface boats and a Submarine. About once or twice a month one or the other of them has either fishing line, a net or other debris wrapped up in the props. I get to clear them and then there are other miscellaneous tasks. Every day I use my Spyderco folder for something. I sharpen knives maybe once a month or so.
This ground down Betty Crocker steak knife has never been rinsed or sharpened, has made over a 1,000 dives in both fresh and salt water in the last 12 years, gets used multiple times a year to cut old mooring lines off wrecks, only cost a couple dollars, and still cuts those 1 inch mooring lines in just a few passes.