Re: will rain hurt it?
SealAll. It is a product sold at most auto parts stores made to seal gasoline leaks. That drain screw is not necessary. many NT style carburetors don't even have one. If you need to clean the bowl, completely remove it. The drain is not needed, seal it with the product recommended.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"