I tried the sensodyne version once, after buying from Amazon. That's not how I would describe it, instead the paste had an unusual warmth to it. Does that sound familiar to you? I'm just asking because I'm curious if I got the real stuff or not, no real way to know.
It doesn’t, but there might be variation between people? For me the toothpaste (sensodyne novamin) has a slightly crunchy feel, and yeah, the smooth glassy coating.