Quick Guide to Refinishing Thermofoil MDF Cabinet Doors 1. Peel Off the Wrap - Remove the thermofoil wrap from the doors. 2. Sand the Surface - Use 180 grit sandpaper to sand the doors and remove any residue. 3. Prime - Apply Renner 648 (non-catalyzed) primer with a roller. 4. Prime second Coat - Spray with Renner 648 (catalyzed). 5. Sand Again - Lightly sand with 400 grit sandpaper and a superfine Festool foam pad. 6. Apply Colour - Spray two coats of colour using Renner 765 (catalyzed) This is