Re: Building 4-way pallets: Treated or painted? More questions
Use treated for the 2x4's and especially the 1x6's on the bottom. Try to find 1x6's treated for below grade use (not easy to find). I would also strongly recommend using a treated board for the middle strip on top that the clips attach to. Yes the bees come into contact with that but it is where pallets always rot first. Ideally some type of non wood material the same thickness as the rest of the top rails is ideal here but I have never found the ideal product of the right thickness.
"People will generally accept facts as truth only if the facts agree with what they already believe."- Andy Rooney