Yes they are white fibreglass rudders and i repaired them with glass and filler so they are structurally sound but obviously the repaired parts show up as translucent areas next to the white gelcoat.
I can't just gelcoat over those patches as I'd end up with a high area so I'd have to do the whole rudder. I guess I'm just looking for an easy solution.

Harry I think the easiest solution for you would be some rudder covers, they'd keep the sun off with the added benefit of protecteing the rudders from the small knocks they get all the time