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?
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 .