Stycon adhesive is a strong durable glue to fix polystyrene cornice to walls, ceiling, wood or metal. The adhesive can also be use to fix polystyrene ceilings to brandering. Stycon adhesive is sold in 260ml tubes and cost R14.50 per tub. One adhesive tube can glue between 8m to 10m of cornice. I mostly like Foam-Safe [http://www.parsonadhesives.com/parfix/ca-glue.htm|CA Glue] and 5 min epoxy on my builds. Most of my foamies are built fast to get in the air as quickly as possible. If I had more patience and wanted to build a better looking model.