We wax dip and then paint them while hot.
Once the wax is sucked into the wood, only minutes, we then apply a coat of paving paint (quick dry).
This coat will dry quickly, again only minutes, and a second coat is applied.
Our time line is minimum of 6 min, can go to 10 in the wax at 150C, 2 coats of paint and the box is finished in about 12 minutes for a 6 min dip.
Screws for clips are put in predipping.
Our paint only boxes are starting to show rot in 10-12 years but our wax dip boxes have only been going about 8 years.