I built a large planter using untreated wood. Before pouring the potting soil into the planter, I have to paint the the planter with something that will protect it from the soil, the humidity, etc.
I would need to paint the interior to protect the wood from the soil, but also doesn't poison the soil and/or the plant.
I would also need to paint the planter exterior to protect it from the elements (sun, rain, termites, etc).
What do you suggest I paint it with? I prefer painting the whole thing with just one paint, instead of using two paints.