Use a gloss base coat
One thing I've learned in painting flat OD is to use a base coat over the primer that is full gloss with hardener, then paint the top coat with with the flattener reason being the flattener is basically like (or is) chalk which will let some moisture enter the paint and get down to the primer and then to the metal. Putting down a full gloss coat provides a good moisture barrier.
From playing around in the past I learned that about 20% flattener matches the original flatness pretty well particularly if you spray the top coat on the dry side, another reason for a good gloss coat as the first coat.
For those of us who don’t paint all the time another tip is practice, paint all the non critical stuff first like the underside of the body or the floor of the cargo bead, get your technique down than tackle the stuff that every one will see.
Cheers Phil
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