You would have to find a way to maintain registration between the top and bottom and deal with the adhesive squeezed out in the process.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Saturday, July 22, 2017 10:19 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: Attaching two PCBs together
Why don't you apply the chosen adhesive and run the thing thru a cold or
warm paper laminator a few times.
.