I tried micron extra, rubbed off too quick. I liked altex #10 and now use ultra. Only changed as a few years ago couldn't get in #10.
If you clean often, get a hard one, if you don't, extra or micron 66 might be the go.
So don't get cat 3.....
I don't understand how they can run an organised rAce like this, but it's so awesome that they can.
I think my favourite boat is Felix the cat. Awesome.