zaino
Hands down the Z6 gives a clearer shine on black. On the otherhand, the Z8 gives a softer, thicker coating, more slippery feel, but less optically clear overall.
IMHO, Z8 is a great product between washes when you don't want to layer another coat of Z-2 Pro.
But in the end Z6 is still the champ between coats of Z2 Pro.
Zaino is the BOMB!!!






