Hi, the gtechniq website says
• C2 can be used with any other car care products as a base or top layer
So you'd think u could use either. I'm after trying some c2v3 used it a few times now on one of my customers GTECH detailed car. The quickness off it & if it lasts up to 8 months or even half that its gotta be good, and if u can use it on a wet/damp car all the better esp this time of year. i'll be watching this thread.
I fancy trying this too. My cars currently got 2 coats of Dodo SNH on top of a couple coats of AB Cherry Glaze, and I've been happy using AB Project 32 as a top up after washing until now, but want something longer lasting for the winter.