K390 Spyderco Endura4 review after first week

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Out of the box it was pretty much flawless, not too loose, not too tight, no rattle, no blade play.
And it stayed that way.
Fit and finish is flawless.

The knife is very light and pretty thin. It disappears in my pocket, I even forget it's here.

Ergonomics are really nice and the handle supports a lot of different types of grip while being really comfortable. It's not the bulkiest handle, but it's more than enough and is pretty comfortable.

Performance:
This thing is a real slicer. It passes through anything with minimal effort. It's really a joy to use.

K390 steel is really hard to dull. And I really mean it.
It took me several days of use, and I even looked for excuses to use it, so it was used more than what I'd usually use a knife in that period. And it took several days to take factory edge from shaving to barely shaving. And we all know that factory edges hold up less than edges you put on by hand.

About a minute or 2 on #600 diamond and it was shaving nicely again, and then quick stropping with diamond paste and it was popping hairs again. So it takes an edge really easy in my experience, with no issues with burr.
I however feel the urge to sharpen it all the time as I just can't believe there's a steel that stays sharp that long after such use.

Corrosion resistance is acceptable, it's really hot and I sweat like crazy and it still has no rust spots. I do oil it before carrying it though.
I used it in the kitchen too.
I used it to cut lots of pork, then onion, tomatooes and on other ocassion to make fruit salad.
It does develop patina fairly easily


Pic of patina on the link.
 
Great write up! The Endura would definitely make the list of the top 10 greatest production knives of all time (or at least my list). It has been out-cutting almost all the competition for 32 years now.
Endura is a knife that actually cuts, unlike a lot of folding sharpened pry bars or even cleavers lately.
K390 is good stuff. Spyderco always seems to embrace new alloys and cook them up right.

I have the Endura like yours, and have been eyeballing the Stretch in this steel.
K390 is really impressive steel and HT is also done right here.

Stretch is an awesome knife and I also wish I had one. These knives are really impressive and they also carry very well.
 
I've used ZDP-189 and K390. K390 is much faster to sharpen than ZDP-189. They both hold great edges, but take zdp-189 too thin and it will chip out on you due to to its high hardness. K390 really shines with a thin edge. I freehand sharpen naturally around 15 degrees and I've yet to experience any edge damage with the K390. The secret to both of these steels is to not let them get too dull to begin with, because ZDP-189 can be a bear to sharpen out chips in the edge.

K390 Endura
FtyqYMy.jpg
 
Shouldn't have clicked in here (sound of money disappearing)... I currently don't have a K390, but did have an Endela (great model too). I was stunned by the edgeholding vs sharpening ease. Like really stunned. To me, it seemed near M4-like in edge performance, but easier than VG-10 to sharpen (??!!). So, Endura (long time fav), Stretch, Endela, Police? Hmm...
 
Shouldn't have clicked in here (sound of money disappearing)... I currently don't have a K390, but did have an Endela (great model too). I was stunned by the edgeholding vs sharpening ease. Like really stunned. To me, it seemed near M4-like in edge performance, but easier than VG-10 to sharpen (??!!). So, Endura (long time fav), Stretch, Endela, Police? Hmm...

Everyone needs some K390 in their life! I have 3 Spydies with K390 and they are all keepers.
 
I only have 2 of so called "supersteels" right now.

CPM-3V was the first one I ever got and K390 is second.

They are both easy to sharpen and really hold an edge for what I use them for and are really tough for their applications.
 
I've used ZDP-189 and K390. K390 is much faster to sharpen than ZDP-189. They both hold great edges, but take zdp-189 too thin and it will chip out on you due to to its high hardness. K390 really shines with a thin edge. I freehand sharpen naturally around 15 degrees and I've yet to experience any edge damage with the K390. The secret to both of these steels is to not let them get too dull to begin with, because ZDP-189 can be a bear to sharpen out chips in the edge.
Nice reply. Yes, the zdp can be chippy. It makes you think of a box cutter blade. But I've brought my zdp knives down to less than 10 degrees per and they cut like lasers. I'm just care full not to cut anything harder than cardboard.

The most frustrating thing for an EDC knife is when you have to cut raw or cured meat. I sliced up beef stroganoff with my s30v and it dulled because of fat, gristle, and plastic (cutting board) coating the edge. My zdp dulled when I was cutting ham from the bone for the same reason. At least for both, a light touch up with oil and stropping cleaned the edge out real fast.
 
I have a ZDP Endura. The idea was cooler than the thing, though... I don't know. I feel like if, once I learn to reprofile, take it down to a low angle, it could be worth it as a strict up and down urban task cutter.

K390 is my new love, and the serrated K390 Police 4 has changed knife carry for me. Said this a few times now. Still honeymooning, but I seemed to have an easy time touching the steel up on the wharnie Dragonfly, which inspired purchase of Police. Once I got that, I put a wave on it, and... I've honestly been carrying just that and a SAK for the last few days since I've got it. I hope the serrated version will hold up to many years of use the same as the others, and I know Spyderco will do me right if I have trouble.

I feel like this is a really special steel here, it's like 10V-class and easy to sharpen it seems. I haven't had to touch up the serrated edge yet. But I am constantly trying to use the Dragonfly to develop patina.
 
Count me as another K390 fan. I had heard so many great things about the steel that I just had to try it out, and I went with the Stretch because it was a model I had never experienced. It did not disappoint. In fact, I have carried it much more than I ever intended to. Such an enjoyable steel to use. Kudos to Spyderco, and honestly I think LW Spydercos are the ideal platform for trying out interesting steels like this. Just simple straightforward cutting tools.

75AqMpy.jpg


BAUkJlk.jpg
 
Count me as another K390 fan. I had heard so many great things about the steel that I just had to try it out, and I went with the Stretch because it was a model I had never experienced. It did not disappoint. In fact, I have carried it much more than I ever intended to. Such an enjoyable steel to use. Kudos to Spyderco, and honestly I think LW Spydercos are the ideal platform for trying out interesting steels like this. Just simple straightforward cutting tools.

75AqMpy.jpg


BAUkJlk.jpg
Not even just trying out, but as keepers, too. I actually see some definite superiority to the Native 5 LW vs the copper-milled 7oz brick of a PM2 in Rex 45 (though copper has it's charm!). But you're right, the linerless D-Fly was my intro to the steel! Awesome patinas, man. :)
 
I've used ZDP-189 and K390. K390 is much faster to sharpen than ZDP-189. They both hold great edges, but take zdp-189 too thin and it will chip out on you due to to its high hardness. K390 really shines with a thin edge. I freehand sharpen naturally around 15 degrees and I've yet to experience any edge damage with the K390. The secret to both of these steels is to not let them get too dull to begin with, because ZDP-189 can be a bear to sharpen out chips in the edge.

K390 Endura
FtyqYMy.jpg
You took those scales off a trainer, or you dye them? Because that looks strikingly similar to the trainer scales.

Also a beautiful patina, vinegar or natural?
 
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