These thin black foam gaskets don't look sturdy enough for the long-haul here in the intense sun, intense rain sub-tropics. A telco buddy turned me on to the excellent RTV silicone they use, called "B-Sealant"; skins quickly, to avoid dust, but remains uncured for a long working period, to facilitate mating of parts.

He says they use the stuff everywhere outdoors, on everything--caps, covers, those slit rubber ports with cables passing through, high amperage power cables, etc.--and it's good for 10+ years, REAL LIFE, not "caulk tube marketing years", lol. (Seriously, in what sheltered lab do they derive that "50 year" figure on the $1.99 latex caulk? Stuff goes from caulk-to-chalk in like 4 years in So-Fla...)

Thanks in advance.