Maybe a light scuff sand to remove any gloss and give your new paint something to "bite" onto, clean, and repaint.
Laying doors flat to paint is okay(?) if you have one or two doors. I painted six doors, both sides, last night. One of them needed two coats both sides. In an office, where would I have laid them? On six sets of sawhorses? I couldn't have done both sides if they weren't hanging, not in one night. In all my years I've only painted a couple of doors flat, but for none of the conveniences or necessities mentioned. Not trying to belabor a point, but don't want an inexperienced HO to think it's necessary or even a better way, it's not.
Over applied paint will run and sag on a hanging door, but it will also puddle on a flat door. Properly applied, the paint will hang and level out on a hanging door.
A flat door is a greater dust magnet than a hanging door.
Working over a flat door has a greater risk of a drip from the brush hitting a finished area and getting missed or having to be brushed out creating a mar.
And the amount of handling involved in hanging a heavy door with soft paint could necessitate a possible recoating after hanging. And if you get deep fingerprint impressions on a sheen coat, good luck.
It's not worth it.
It takes 3 or 4 repetitions to get it through Joe's head!Did I not already make that point?
In 3 sentences?:yes:
It takes 3 or 4 repetitions to get it through Joe's head!