I'm hopefully doing mine this weekend. I rented the prep tool and scratched up the surface. Since I had to wash it anyway I did the cleaner/citric acid solution since I had it with the kit. When dry it looks like all the sealant is gone and I have a nice profile to accept the epoxy.
I am going with Rokrez, as I found a great deal on 3 kits on Kijiji (I'll maybe have one left if anyone wants one after!) But I also have been reading that a topcoat is a very good idea. Simiron, who makes Rokrez recommended their product but it is impossible to get in Calgary, or western Canada. So I found a Calgary Company,
https://www.polymersciencecorp.com/
and bought one of theirs. I'll test a small spot to make sure it is compatible with Rokrez, but it should be fine. If I were to do it again I'd probably just go straight to them for everything, but I got a good deal on the Rokrez.
Anyway, I think it should go pretty smoothly. I hope!