Ken wrote:
Just learning about wood and enjoying it quite a bit so far.
I think one rule of thumb that I have learned is that
laminating boards to get larger dimensions is ok.

I'm building a pretty nice mailbox and need a 4x4 cedar
post for the above ground part of the post. I'm having
trouble finding the post in my area so I'm just going to
glue (titebond 3 waterproof) four 1 inch cedar
boards together to get my post.

For outdoor work I'd use epoxy.

If you truly want a full 4x4 that will be truly square, laminate say
5x5 minimum and then trim to size.

Lew