I need to make a lid for my Cistern. I plan on using some 2x4s and perhaps
3/4" plywood. I am wondering if I paint this, will it take on any measure
of weatherproofness?

If not, how do i make wood weatherproof. Also, without handling too many
nasty chemicals. I'm not interested in the treated wood, but I can use it
if necessary. Can't afford cedar.

The water in the Cistern is not for drinking.



CLG