Over the winter I decorated several terra cotta pots with decoupage themes. I have a chiquita banana sticker pot, an Obama pot and a pot covered with stickers that you get when you vote that I have been saving for a while. I thought the Mod Podge that I used would be good enough, but as soon as put a plant in one of these and watered it, the water went through the porous clay and re-wetted the Mod Podge. So I need something to seal the terra cotta from the inside.
But I don't want to use anything that is a chemical, like a paint or something like that. I know there has to be a natural water proofer out there that makes sense. I just don't know what it might be.
Some sort of food grade sealant? Beeswax?