I would like to replace my leaky old cowl vents with the Nicro Solar vents either the Powervent 3000 or the Day and Night 2000. I searched the archives and found quite a bit of information. The one thing I couldn't get an answer to is: How are they at keeping out rain? Can you leave the boat for 1 to several days without closing them up and not come back to wet cushions or other interior stuff? They claim to be "water resistant" whatever that means.-Smitty