I like it when the track is wet. You can learn finer nuances of car control at a lower speed.
N80, of course it's difficult to draw conclusions from a video alone. But I noticed your hands were very smooth all the while prior to the spin. This implies to me that you weren't having to make corrections and thus weren't driving near the limit of traction. So when you did find a limit it was a surprise.
Especially when it's wet, I like to almost constantly (at least near and in turns) make control inputs that will induce slip and then recover. This happens very fast in little repetitive spurts. If you're near the limit, these inputs won't have to be large ones.
You may have ridden with an instructor or someone else that you and your track friends refer to as 'handsy.' This is what he is doing. I know, I know, they preach that you should be smooth. They drill it into your head. But what you should realize once you're past an intermediate level is that 'smooth' applies to the path of the car, and that your inputs should be whatever is required to make that happen. Don't tell green students this yet.
So anyway, by constantly experimenting with the controls, by forcing a tiny bit of slip and recovery, you always know how far away a surprise would be. You take the surprise out of it. Of course that's within reason allowed by predictable conditions.
The first time you try this, do it in a slow, wet carousel turn that has clear runoff area. You'll notice this gives you conditions similar to a skid pad. Once you reach that steady state condition around the turn, try a quick but small tightening of the wheel followed immediately by a quick counter steer. If you were near the limit and you get it right, the tail should have stepped out for just a fraction of a second. Unless it just under steered.
Feel this out and get used to it. Also do the same thing with throttle control and throttle combined with steering. Eventually you can do it while trail braking into a turn.
Now slippind and recovering takes a little riin through a turn. Fast guys will train themselves with turn out points a couple feet inside the edge to aim for, and that way they've got a couple feet of wiggle room to squirm as they lay the power down.