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Looks antique!
I used to edge MDF the way you've done it but if you have the tools to hand sanding it to 400grit is the way to go. It takes very little time in comparison to filling and you don't need to treat the edges any differently to the face once it's done.
I bevel the corners of mdf while I'm sanding the edges as it makes the painted edge more durable.
Airhead
rhowe
All you need for a smooth finish