I'm planning on building a wood planter box for some edible herbs. (Similar to this; in Maple and a bit more squarish.) I already plan to glue the wood with Tidebond III as it is waterproof. My question is how to seal the wood itself from the water.
So far I've seen the following suggestions :
- Roof cement; doesn't sound too edible to me...
- Liquid rubber
- A thick layer of beeswax.
What would be the best? Should I consider Cedar instead of Maple?