Zardoz under will prevent anything from sticking onto the base! You would need to hot wax that to mix it. Don't do it.Skied on Dominator FFC P2 paste on Wednesday at Saddleback in Maine. It held up most of the day. I had planned to try Fast Wax HSP40 there on Thursday but the tin I had in my bag was dried up. Ended up using an unopened free tin of Fast Wax HSX40 that came along in the order last year for the HSP40 on our skis for Thursday. The HSX didn't hold up beyond a few runs.
I'm planning for a few trips out to ski Superstar at Killington in May. I'm unsure about what I'll put on the skis for those trips.
I do have some Zardoz left over from a few seasons ago. Perhaps I could try putting that on under some other wax. In the bottom of a drawer in my shop I have a unopened pentagonal package of Maplus Universal Yellow that I have absolutely no recollection of ever purchasing. And a few bars of ignored Swix BP88 and Purl Yellow.
I feel as if I should use up some of the random stuff around the shop before ordering some more Dominator paste...
As you have found, the FFC as all the Dominator paste waxes hold up quite well. Used on a well-prepared, and clean base (brush out before applying) I have found them to be extremely durable. Look here.