No need, just use solid stain.

Look at our Sebastopol Hillside Deck, on the decks-ca site, that is a solid stain on the posts.

http://www.altereagle.com/

http://decks-ca.com

http://kingofcrown.com

Alter Eagle Construction & Design

If you have the new pressure treated wood which has been out for at least a year now you can't apply stain to it for a year as there is so much copper in it that it will bleed through the stain and possibly give you adhesion problems. What you will need to do is apply a coat of Seasonite from the Flood Company and wait a year before you apply your stain.