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Repair cracks in coving?

Hi folks what’s your system on this, on mdf what primer would you use? Would you sand mdf to stop it swelling? Would you just prime and fill or scrim, fill?

Hi darlic.
I repair cracks in coving and any other plaster/gypsum materials by opening out the crack, vaccuming out then applying toupret ‘fibracril’ followed by toupret filler then sanding down.
I use Zinsser 1-2-3 to prime MDF before any filling which again might be Fibracril and/or toupret filler followed by a light sanding .

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