10-22-2014, 05:25 PM
Those are quite lovely! Great job. :)
I've got cardboard/foam columns and they have held up over 6 years at this point and that's including getting drenched a few times. I usually leave them out for at least two weeks each year too. I think if you know that heavy rain is coming, making them easy to pick up and get into a garage is a good idea, but the paint (if acrylic/latex) acts as a decent moisture barrier and those columns will hold up longer than you think!