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I bought a tin of MDF edge primer on a whim that I have yet to test out. Otherwise I saw a chap doing fine passes with toupret fine surface filler on the cut edge and sanding with a relatively high grit. Once painted it had the same appearance as the face. You're welcome to the tin of unopened primer or if I recall, it wasn't very expensive at SF/TS.
I've done loads of these (sadly). 9mm mdf and sand the edges to 400 grit is the way I've settled on. It does take some work to get a good decorative finish. I glue and screw them together, countersunk screws. Toupret wood filler to cover screws etc.