No. The damned thing is like a round razor blade. It's absolutely lethal.
I think I'd just buy the sharpener thing if I were going to that effort, tbh.
In all the years I've been using them I've only sliced myself once. I brush it agin the front of my thumb in a moment of inattention and sliced a neat, instantly bloody line, just about down to the bone in a split second.
Once was enough; I'm not risking that again. Scalpels dream of being this sharp. Mine cuts through six layers of cotton with absolute ease, it goes through flesh even quicker

It rotates simply by being loose enough on the mandrel that it turns as it cuts the fabric.
I think Dave's right about the titanium edge thing too….much like a buck knife; sharp as a sharp thing, but oh they chip and snap if you look at them wrong. Probably how I managed to chip that last one.
On the whole they last me very well indeed

I did buy some of the cheap ones from China on ebay (they're probably all made there nowadays anyway, just some are better finished /hardened than others I reckon) but I went through five of them in the time I usually go through one, so a wee bit of a hmmmm? moment. I bought another set from the UK that were identical to the ebay/China ones to look at but they lasted me twice as long….cost me more right enough.
Anyway, that's rather why I wondered if this cutting tinfoil trick would work. I strop my knives every time I use them before I put them by, it'd be no great hardship to do the same to the rotary cutter blades if they'd stay sharp longer. I just don't have any of the cheaper blades to hand right now.
Thanks for the thoughts and information on this folks

:You_Rock_
M