The boat paints have all been updated to look more like metallic paint which hopefully helps them look less bland, especially on constant color paint jobs without any patterns. Those have all looked pretty plain and boring until now, this should hopefully improve the boat visuals a little bit.
This new paint is automatically applied to all paint patterns, you don't have to select a specific pattern or do anything in the simulator to use it.
Screenshot:
http://steamcommunity.com/app/501090/screenshots/?p=1&browsefilter=mostrecent#scrollTop=0