How to waterproof a pallet planter box
Picture a pallet standing up. The bases on each runner/rail have been filled with a piece of wood. I tried this once before and just used silicone around the join but it was no use, water still came through when I watered the plants.
What would be a clean, simple way to water tight the edges of the bases? I've attached an image of what we are trying to create. A friend suggested just adding rubber to each planter compartment.