I'm adding to the CA aplication. I find CA not to work well on plywood, it has a tendecy to sit in top of the wood and isn't strong at all. When I glue plywood, if it's building something like a wing I use wood glue and if its a heavy load structure I use epoxy. I als use thin CA instead of thick it soaks into the wood better making a stonger joint when everything is true. I have seen thin CA soak all the way thru the wood . I know some people will use some CA's for ply but I haven't found any that works well.