Titebond is available at most "Home" centers or hardware stores.

Try this with Titebond. Apply glue to two surfaces and let the glue dry ( 20 minutes or overnight or a week later > time is not the issue ~ do not assemble). Then get your iron (covering or the one used to iron your shirts) and iron the two pieces together. This will form a bond that is as strong as if you clamped it. Used for sheeting just mark where the ribs are and "paint" the glue on where contact will be made. No pin holes and it can be done quickly.

I am currently using Cyberbond CA. Have used Goldberg / ZAP /
and others in the past. The Cyberbond seems to be the CA of choice for many IMAC pilots.

Bill