You can go to your local signage shop and get some Black Sticky Vinyl to apply to the melamine. Need a hair dryer to get the vinyl to stick really well (but without can also be done). I am sure they will explain how to lay it.
Waterproof and UV Resistant upto 8yrs (8yrs for cast = more expensive, 5yrs for Calendared = mid range, 3yrs = low range) Cast is not alot, maybe $10-$20/m at 1220mm wide.