When gluing them together I found using a bungee cord with just a little tension around the circumference made the joints a little tighter. They find square on their own because of the dovetails with the large surface area.
Yes, I do the same, but with 1" ratchet straps.
Takes longer to paint because of the recesses in the sides. I will probably add more to the operation this year.
So very true, painting is/was a real chore, but I have gone to painting with an air sprayer and it is much quicker/easier especially when doing quantities of them
Still prefer wood supers on them for harvesting because of the ding factor as Robo stated.
I still use wood for supers as well, mainly due to the cost factor. I can build my own mediums cheap and don't really care about the insulated value since they aren't used in the winter. Of course dealing with covers can be a pain at times.