Repairing MDF shelf finish


Does anyone have a good technique for repairing the plastic finish on an MDF shelf?

I have a SolidSteel rack and one of the shelves has a ding in a very noticeable place. The plastic coating has been knocked off, but the underlying particleboard is OK.

I'm thinking there must be some product that would adhere to the particleboard and could be smoothed in and made to match the existing plastic, and then painted black when it hardens. Any suggestions?

Thanks - David
magister
I use brown paste shoe polish on wood scratches and marks. Use a rag and rub it in until it blends in with you color.
Putting your question into Google, this is what I found.

Repair

Any help with your situation ?
Thanks, Albert; that looks like what I need.

Musical Therapy's idea idea of using shoe polish is clever, cheap, and would work for natural wood finishes, but in this case I need to rebuild the hard plastic layer on top of the fiberboard.