I took out some old boards and flipped over others on a very large deck. ALL OF THEM. Sun and weather beaten wood. I stained with Cabot Semi-Transparent stain (Australian Honey Teak). Oil based. Now I've got sealant ready to apply. Do I need it? Does it alter, or ruin the nature my work staining the wood? I'm thinking I may have to apply sealant every other year. I'm OK with that. It beats pulling nails and replacing boards. When I bought home, the deck was totally neglected for years. Rest of home beautiful. I don't see how people would let it go like that.