We have a boat about 20 years old that is starting to show its age. The original white gelcoat is getting "dull" and gets moldy because it tends to have minute cracks. Of course it looks new when I wash it with bleach before an outing. Fortunately every part that is under the cover looks new, its only the top facing parts that are outside the cover in the sunlight. The hull is nice and shiny.
Is there a "wax" or some other hand applied coating I can apply to improve its finish?