I need some help. I just built myself a 12x18 barn to house my JD Gator. I used 1x12, rough cut hemlock, board and baton style. Im not sure if I want to stain it a color or leave it natural. If I do not stain it a color what is the best finish to keep it from turning a dark gray/black color? Could this product be sprayed with a hand pump, weed type sprayer? Also if I leave it natural color and use some type of sealer would that prevent me from staining it a color at a later date? Thanks in advance.