exterior wood finish
The durability of the exterior finish will be held to the type of wood and when it is applied.Oil is the best choice but technology has advance in water base stains and paints.
Exterior Stains- transparent and semi-transparent,depending on the look you want to achive.If the wood is in not too good of shape use a semi-transparent stain as it will hide muck for decks after the finish is applied you can use a Water-repellent preservatives