What affordable, non-toxic waterproofing coatings or DIY treatments are there for coating wood, that could be considered environmentally friendly? (Having built a small plywood boat I'm a fan of epoxy, but I shouldn't even whisper that!
) The question arises for me in the context of container & raised bed gardening, wood seedling trays, growing boxes etcetera. I'm sure there are many non-gardening pursuits where the question arises too. Who has thoughts & suggestions?