Have not done the Vette as yet, but my son and I did his Nissan 350Z this past Saturday with the Zaino products. A bit of work as we tried to follow the instructions to a "T" for the washing, claybar, washing again, and the various products (Z5, Z6 & Z2). My arm was ready to fall off but the car looked fantastic!
We did two coats of both the Z5 and the Z2 with an application of Z6 between each coat.
I noticed on the Zaino website that they do not recommend using micro-fibre towels at all (surprise to me...used them for years on other cars). Only 100% white cotton towels made in the U.S.A. Good luck finding a towel made in the U.S.A.! I needed to buy them so I figured I would do what the Zaino website suggested since they implied that towels made elsewhere are really not 100% cotton even though they say so. I can tell you for a fact...there are NO towels made in the U.S.A. in Parkersburg. I checked Belks, Elder Bierman, J.C. Penneys, Sears, Kmart, WalMart and Kohls. The Zaino website indicated Cannon towels or FieldCrest were brands to look for. Think again! Every towel I found made by Cannon was "Made in India". I never found anything with the FieldCrest name on them.
The ones made in India seemed to work just fine.