I routinely do a Z6 wipe down after each coat of Z2,Z2-PRO or Z5. During Z8 beta testing I also used Z8 in the same fashion. Both added a little extra gloss and aid in the application of next layer of polish.
Final step. Save the Z8 and use as topper. No significant cost effective change in outcome verses Z6 between coats.
I just did this as part of the beta testing of Z8 for alternative uses of Z8 and compatibility evaluations.
Many times I used the Z8 between coats that were applied the next day (vehicle in garage). This did add something to the appearance but very hard to quantiate or determine if imagined.