Why do you say you recommend to wait after a year to paint stain a cedar fence?

Often, it is recommended that you wait a year to paint a wood fence to allow time for it to weather to the point where all the tannin, or in the case of pressure treated wood, all the chemicals have leeched from the wood. There are stains made to go over unweathered wood, and you can paint the fence with 100% acrylic paint or solid stain before it's weathered, but you may see tannin or chemical staining over time and it will take longer for the leeching to complete. I wouldn't recommend using oil based primer, paints or stains because they could peel off over time when coating unweathered woods.

Woods that don't leech tannin, like pine, oak and spruce can be primed and painted immediately.