I’ve experimented with various adhesives to use with EZboard and have found what I think is the easiest to use with great holding strength. Go2 Glue is a Loctite product. No 2-part mixing which is good. I don’t like mixing epoxies and throwing away the unused glue.
Simply apply Go2 Glue to the surface and hold or clamp the pieces together. It sets quickly and cures completely in 24 hours. I used it on the picture frame I recently showed you and it held perfectly with no glue lines.
In home centers you will find small bottles. I’ve decided to sell the large bottles so you get more for your money.