Re: Paint and primer in one
Mis-tinted deck paint, especially oil-base opaque or semi-transparent. The best material I have found recently is Cabot's semi-transparent or opaque material that is oil-base, one-coat, period. The instructions even say take everything else off before using if it's not raw wood, then paint it once, no re-coating. The mis-tinted version was somehow an olive drab that looks absolutely great in my yard. Couldn't find that color in the book or anything like it (mis-tinted severely, apparently) when I bought a full-price gallon to use on a project.
On a different note, my out-in-the-elements mailbox post is made from a 6x6 treated timber that I rounded up to look like the pillars on our Southern Colonial porch front. I painted it in 2004 with two coats of Olympic oil-based exterior deck primer followed by a coat of paint, and it's still going great. I wish I could still find those Olympic oil-based paints.
"I thought I made a mistake once, but I was wrong." (heard often from the late David Sebree) Still making them, myself