Hi there, I'm making some heavy duty shelves and plan to just glue up some dimensional lumber then joint and plane it down (I have a 20" planer). I need the shelves to be as stable and flat as possible, and wondering what you would advise using. Cheapest would be just kiln-dried 2x4's, but I could also see using 4x4's if that will be more stable long term. The shelves will be about 3" thick, and roughly 80"x 20". I'll be coating with lacquer primer (Zinsser) then epoxy paint to keep out moisture (this will be holding up fish tanks), but not sure what people advise using 2x4's (~14 glued up per shelf) or 4x4's (~6 glued up per shelf)?
Thanks for the help - appreciate it.
Best, Peter