Glad you asked...
You will need some acrylic glue and some bonding clamps to hold the plexiglass together while to glue bonds. Allow to dry for up to 24 hours.
Then again, this answer might help you...
You would use an acrylic glue. It cleans up good an gives a really good seal. Make sure to clamp it, till it is completely dry. You can do so many things with plexiglass.

