First cut the MDF down to a 4×4 square.
Now mount the square and cut the cake out with both the roughing pass and detail pass
Give the mdf a light sand to fix any burrs that my have formed during cutting.
Pour the resin into the pockets as carefully as possible. The more you spill the more you sand.
Now sand off the excess resin. There will probably be air bubbles that get exposed from sanding.
Apply the lacquer to give the resin back its shine then let dry.