Our arcade cabinets are made using black melamine. If you accidentally scratch your cabinet, you can hide it quite well with either a black Dry Erase marker: Amazon, Wal-Mart, or an Ebony Furniture marker: Amazon, Home Depot (also sold in store).
If the wood is chipped or broken, you will want to use wood putty to repair it first, then use the marker mentioned above.
If a 90-degree corner is broken you can purchase corner protectors to cover the damage.