Flattening agent question

NextGen Classics

Floor sweeper
I am doing another matte finish only in a single stage. My question is do I need to add flattening agent in all coats or just the final? Thanks
 
Also, I should point out if the coat before is not allowed to flash enough, it can overide the last coat.

Epoxy is worse as if doing an engine bay that requires total flatness. I will spray two full coats when doing the frame, then let sit overnight to flash, and next day, depending on how flat, add 50% fast reducer or 30% acetone and spray one medium coat and done.
So it depends on what you are spraying as to the amount of flash time.
 
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