The new solid color deck stains are water based acrylic latex and are very durable, but careful surface preparation is critical to success. On well weathered areas you can power wash and then go directly to product application following package directions. In protected areas where an oil based product was used previously and the surface is not well weathered, the surface prep required for good adhesion is more complicated. I usually power wash then prime the horizontal surfaces in those areas with an aggressive exterior rated oil based primer then follow up with the solid stain. Ben Moore Arborcoat is my preference. These methods have served me well and I have yet to have a call back.