consider popular on the 3d planes and flying wings , Why? EPP is soft yet its properties springs back into shape making it resistant to Crash impact damage and ease of repair work. in simple terms a much durable foam material. the only trade off is its flexibility require additional stiffening with the use of CF rods.
Adhesive: PVA , Wood Glue , Hot Glue this material can also take on Contact Bond glue and Cyanoacrylate
Paint: Spray Can Paint