Why stain
Protection,Exposure to the elements can ruin wood. Water, for instance, seeps into wood and supports the growth of mold and mildew. Taking in water and being exposed to very low temperatures can also cause wood to break down and weaken. Sunlight, on the other hand, can cause discoloration, which you’d want to avoid if you value your project’s natural appearance. Staining seals off the pores in wood, preventing it from taking water. Besides adding color, the treatment also adds a layer of protection from the sun’s UV rays, minimizing or preventing discoloration.