Just wondering if anyone has sanded and painted their radar arch. I have a 2005 320 and my arch is cracking and chipping paint off. This started before I owned the boat-it was 2 years old when I bought it. I took all the screws out and placed silicone on them before re-installing but the damage has already started. I see this is not just a Rinker issue but other manufacturers have the same problem with their aluminum arches. Please let me know how you primed and what paint you used. I am trying to not have this professionally done because of the cost.