The Bananas have been cast from expanding foam & (once whittled down a bit) will be ideal for teefz
I use Evo-Stick Multi-Purpose Contact Adhesive (The Red one, don't get the Green one) as I don't trust Glue guns at all. The Skewers just keep it in place while it's going off (within minutes).
The 3mm foam was originally for the detailing on my Iron Warrior, it's so thin & easily manipulated so it's ideal for the mask.
Besides which, Blue is Lucky right
Couple more pic's.