The Main Instrument Panel (MIP) panels are vacuum formed plastic which attach onto the Display Unit (DU) monitors with screw fasteners. They are manufactured in cathode tube EIS1 (rounded display corners) or LCD EIS2 (square corners) versions. EIS2 has now become the prevalent standard and is seen in most Airbus A319/320/321 series aircraft.
The DU covers are lightweight and they have a tendency to crack because of its plastic structural integrity.
A series of steps are required to fix the cracks; including filling in any gaps and matching the texture and colour of the paint of the OEM covers.
1. Use appropriate plastic glue or adhesive to close any cracks or gaps; if the gap is too large and visible, use an epoxy putty such as Knead It Multipurpose. Sand down to an even level.
2. Spray paint with a primer. Tamiya Fine Surface Primer Gray can be used for this purpose.
3. Use trim structure spray paint to provide texture to the panel. Master Plastic Trim Structure Paint (thank you Tobias)
4. Spray paint with matched colour. Dulux B 11.70 , EE 2.375 , M 32.125
5. Complete with clear top coat; this provides a reflective quality to the panel like the original