I would leave it . Being pressure treated paint will not add any more protection.
But a good exterior stain will.
Wait a few weeks until the lumber dries out good before applying several coats of the exterior stain of your choice.
I replaced the 2x8 boards in the floor of my trailer yesterday. I used pressure treated lumber. Should I paint them or just leave it alone?
What ever you buy, don't buy Thompsons. Behr is hard to beat..
Are you talking about a hauling trailer or living? I put linseed oil on my hauling trailer boards
I shouldn't be posting this but!
I bought a older 16' equip trailer (came with a Farmall cub) that the guy had decked with PT pine a few months earlier. Buddy said bring it by the shop and we can persevere it. Used transmission fluid and old diesel 50/50 mix. He laid it on, dripping wet. Then did it again the next day. That was 6-7 years ago and it still looks great with no soft/rot anywhere. Not even slick in the rain. Not saying it's the best idea just but hey, It worked.
Any cheap oil will also work. Cheap hydraulic oil is used a lot.
I shouldn't be posting this but!
I bought a older 16' equip trailer (came with a Farmall cub) that the guy had decked with PT pine a few months earlier. Buddy said bring it by the shop and we can persevere it. Used transmission fluid and old diesel 50/50 mix. He laid it on, dripping wet. Then did it again the next day. That was 6-7 years ago and it still looks great with no soft/rot anywhere. Not even slick in the rain. Not saying it's the best idea just but hey, It worked.
Old motor oil mixed with diesel fuel works very well. I also sprayed underneath to protect from road spray.
No doubt !! This will last a looooooong time. Just not Eco friendly nowadays . .