I have been doing a few product tests for Wagner over the past couple years. They just sent me the Opti-Stain- Sprayer to try out. I am not one to rave about something but I had to share. Over all it works very well right out of the box. I used it to spray my manger that I had built at Christmas time. Quick and easy to use and coverage was great no runs and I used half as much sealer. Clean up was fast and simple. Here is a link to my review on line. https://www.wagnerspraytech.com/prod...view/208194422
I think this little sprayer would work great on decks and railings and I also think the price is very fair.