I got new skates with Labeda Addiction wheels on;
First time I took them out for practice (1h), indoor polished concrete tiles rink, they easily felt the best wheels I've ever skated on, I've never experienced such a good grip before.
Second and third timed I played on the hockey plastic tiles with equally excellent grip (ca. 2x 1h).
Fourth time on wooden court, no complaints.
Fifth time I went for a brief 30min practice in an outdoor polished concrete tiles rink (same surface as the indoor concrete tiles rink) and experienced a superb grip also. (I used to play on this rink over summer with my previous wheels/skates and the rink was feeling very slippery (to everyone))
However yesterday, on the same rink as the first time (indoor polished concrete tiles) the wheels had no grip whatsoever and I was sliding all over the place. I even tried cleaning the wheels with paper tissues in case there was some dirt/dust residue on the wheels but that didn't help. It felt the same or even worse than my previous wheels on that same rink.
It really is a mystery to me how the wheels could have lost grip on the very same rink in course of a few weeks / 5 hrs of use.
I'm going to play on the plastic tiles tonight so I'll see how the grip is there.