I did a Succulents vertical box for hanging outside can you tell me
by
Barbara
+3
What I should use on the box (varnish) to protect from the outside elements!
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Suggested Project Book
http://homeguides.sfgate.com/waterproof-wood-planter-box-44260.html
I would use the same protection that you'd use on a wood deck in your desired color.
so many options clear tinted semitransparent and solid.
Marine polyurethane would work well, it is made to be in moist conditions.
I would use marine Spar Varnish before you put the plants in.
Marine polyurethane like used on boats. Very waterproof and weather protected.