From the Zaino website.
ZFXâ„¢ is a Zaino Show Car Polish acceleration and appearance additive. It offers near-instant cure time, reduced surface distortion, enhanced polish flexibility, and improved bonding to both paint and additional layers of Show Car Polish. In simple terms, ZFXâ„¢ vastly improves paint surface appearance and increases polish durability.
ZFX has both functions: acceleration of crosslinking and acts as a bonding agent (bonding is used in this discussion to reflect a "glue-like" adhersion (Van Der Waal forces)).
Hope this hopes. :wavey