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What is the waterproof sealant? Is it really non-toxic?

We saturate our cedar boards in a non-toxic solution that seals the wood internally. There is no coating on the surface to flake or chip, and nothing leaches into the soil. Microscopic glass crystals form and bond with wood fibers, creating a moisture barrier that protects the boards from rot. There are no UV protectors so the cedar will fade naturally to silver-gray. If you want to stain or paint the wood, we recommend applying it to the outside of the planter only, as some products can off-gas or leach toxins into soil.