Didn't have the time to post earlier, but I finally got a chance to use the Osmo... kind of.
I only needed to seal some grain prior to an epoxy pour, so I decided to pop the can and gave it a try. While I was at it, I grabbed a scrap of walnut, gave it a quick sand (150 or 180, I forget) and gave it a couple of coats, too.
It's thicker than I was expecting, almost like contact cement in viscosity. As I do with regular Osmo Polyx, I applied it with a white 3M pad, let it sit for a bit, then buffed off the excess. Then I popped them under the $30 Amazon party lights (close, about 3-4"); I didn't check earlier, but they were cured at 60 seconds.
The stuff that I was sealing was white oak - it looked fine but, like a lot of finishes, it took on an amber hue, which I'm not too fond of; for lighter wood tones, I'll probably wait for a 5% white tinted version.
The scrap walnut got a second coat, and I was pretty happy with how it looked, especially for being raw literally 5 minutes earlier -
