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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.
stevo_com-
Thanks, I have some MDF sealer and various primers (adhesion/multi surface etc) The other option I thought of was borrowing a small hand router thingy and putting a neat 45° edge detail on the boxes as this is what I had done on a MDF pelmet at the top of a window reveal where we need something substantial to screw the secondary glazing into, it’s what the carpenter suggested as mating a piece of MDF to a plasterboard corner is impossible as it just moves.
Finishing off with Toupret FSF is a good idea.
I would still rather do this job with a Stanley knife/cutting mat/glue gun though!?
Mr_Smyth
Not what I wanted to hear!?
When I have time I’ll see if I can find a foam cored tile board that’s smooth as it’s so much easier to work with.
This is one of those jobs to be done after we move in so I guess I have a couple of years to do them..