Like an alligator, it can fully digest a turtle shell!
Anyways, I figured I would report back that I very much DO like this stuff now. I hit it with my 180 block and it started coming off in sheets, even with my 220. I found this was a case where trying to cut it down with 80 initially was absolutely pointless. That 80 grit would just bounce right over the top of it and not bite at all, even my '80 grit-turned 100 grit'. It blocked awesome with 220 even though I sprayed it several nights ago.
The other really cool thing is you can literally block the low dark guide coat spots away if you just keep sanding...this stuff builds so much. This was after just one coat. After the first round of blocking I had a lot less guide coat spots than when I started. I've blocked the first coat almost entire off now.
I'm planning on shooting another 3 coats today and I'm guessing that's probably all I will need.