[Silound]

Titebond III is probably the best wood glue you can buy. Waterproof, moisture resistant over time, not terribly expensive, and extremely easy to work with, it dried odorless and colorless.

To glue up those boards then way you're asking is tricky task though. First, without some sort of joint or joining addition, gluing the boards edge to edge will provide the least amount of strength. There's no real way for you to overcome this, because your boards are already so thin to make the shelves. So be careful how much weight you put on them.


Number two, you're going to need some clamps...either QuickGrip style, or pipe clamps, which you can provide even pressure to firmly press both sides of your shelf together.


Start by marking what edges will be glued together, lining up the boards how you want them arranged, and make some small pencil marks so it's easy to re-align the boards when you apply glue.

Brush on a thin layer of glue on both edges that will be glued together, lay them flat (wax paper helps for this to keep glue off of things and keep the boards from sticking to things), align them together how they go, and press them together. Clamp once you have all three boards glued. Clamp firmly, but not so tight that you squeeze out all the glue. Wipe off excess glue with a damp paper towel, and leave to cure for at least 24 hours. Un-clamp after 24 hours, and leave it to continue curing for another day. Sand or scrape any excess glue off as you please (remember to use a dust mask since Spanish cedar dust is toxic).