I didn't notice that much of a difference with my magic spit But on the contrary, I noticed the following when I prepare the tips's back with CA. That's just today I installed UltraSkin after Kamui, so that brought back my previous background.I put some spit on kamui tips and they burnish to a gloss very easy. If I put spit on your tips the water gets absorbed very easy by the tip
I use liquid CA now (ran across pretty good one, grabs like... like nothing else ). I sand the tip glue side until "glue" word disappears and then treat that layer with CA to prevent it getting inside when glueing. The leather structure of two is different at the very first look, and while Kamui tip soaks CA so that I have to apply two layers until soaking stops - UltraSkin tip does not let any glue inside. And the nature of how CA dries on the tips is different with UltraSkins either. If I get hold of a good camcorder I could videotape the process to show what it looks like.
That said, I would rather say absorbing ability of a sanded/trimmed tip is higher with Kamui (though if not sanded, they don't let any water in, like they claim and show at their promo pictures) and not UltraSkin.
On a side note, I burnish the tips with saliva and bees wax and always get glossy finish regardless of the tip brand.