We've lived with the treated pine deck for a year now with plans to change the railing and stain it the same color as the patio cover on the rock deck. Well finally we got a round to the staining part and are very pleased with the results.
Here's my DH at the mid point. Like everything else we've painted, it was done with a brush and a rag. Rollers just seemed to add too much stain and that stuff's not cheap!