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Location: Wapakoneta, OH
I've done that and it worked, but a lot of folks having trouble with the top coat(s) sticking to the factory finish. That's usually some kind of UV cured conversion varnish, and very hard. I had scuff sanded it, and primed with shellac based BIN, and the paint seemed to hold up well...but I may have just been lucky. You might try it and see if you can scratch your finish off....be sure to scuff and prime first. Too bad, painting that prefinished really gives you a smooth surface for the paint.
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.
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Location: phila pa
If your painting over it why waste the money on prefinished 2 sides ? As mentioned you need to sand it if you plan on painting over it . I would hit it with 120 to get as much of that finish off . Factory prefinished ply is very durable and paint wont stay stuck to it long .
Failure is simply the opportunity to begin again, this time more intelligently. "HF"