1950chevypanel,

I am not a painter but I have helped friends/experts paint my trucks. As you most likely know, flash time is the minimum time (not the maximum time) you must wait between coats.

As you posted, the Centari Technical Data Sheet says to:
"Apply three full wet coats. No additional flash is required between passes."

The pot life is 3-4 hours if the Overall Gloss Hardener is used.
Are you using no activator (indefinite pot life), the Overall Gloss Hardener (3-4 hours), or the Ultra Activator (45 minutes to 3 hours, depending on tint additives)?

No maximum time between coats is specifically indicated; however, the pot life would be a limiting factor.

Maybe someone has Technical Data Sheet Information about maximum time between coats? You might want to post information about what Centari mixture you will be using (names/numbers of reducer, and, if you use one, the name/number of the activator, or hardener). Also, post if you are using any metallics additives.