Wet treated lumber cannot be painted until it has dried out. Reason, wet lumber is like a sponge full of water, you cannot add any more.
But, when it dries out you can. Painting wet lumber, the paint will peel off when the lumber sweats off its liquids.
Once perfectly dry, you need to prime it and then paint it. No problem.
Many people may have tried to paint wet lumber and seen that it does not stick then figure that all treated lumber is not paintable.
In Texas, wet treated lumber takes about 3 months to dry out. This is in temps of 100+ and full sun. It takes awhile.
Test: Whack a wet piece of lumber with a hammer and you will see chemicals and liquids fly. When dry, this will not occur.
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