A coat of International Danboline paint would brighten it up and have it looking like new, and it's a lot easier to use and apply than gel coat. The attached photo shows an area on a friends boat where he was in the process of having a bow thruster fitted. The area around the tunnel had been freshly painted with Danboline which was all bright and shiny until he and I decided to add a wooden collar around the tunnel where it passed through a centreline bulkhead. This was in order to prevent flexing of the tunnel under the weight of the thruster motor in bad weather, and in drilling the holes for the screws, some dust was present in the deeper part of this space which has detracted from the overall appearance and cleanliness that the Danboline provided.