I have to reapply the finish twice a year and am very unhappy with the finish because the floor is turning dark. Nancy Dear Nancy, Floors are hard to keep looking nice. Exterior floors with clear finishes are next to impossible to keep looking nice. There are just too many factors that conspire to dirty up a deck. I wish you had mentioned what type of product you are using on the floor now.
All clear products are a problem outdoors.
Ultraviolet rays eat them up quickly and even if they have UV inhibitors, enough UV will get through to attack the wood and create deterioration of the wood itself. Other problems are introduced with water that may pond on the surface, dirty shoes that abrade the coatings or wood itself, and the considerable expansion and contraction cycles that a softwood is likely to experience. Some products, like Thompson's Water Seal, are simply wax in a solvent base. They work well to make water bead, but must be reapplied often to maintain the surface. Fortunately they are very easy to apply and leave no film that can crack and peel.