I used the same evostick to re-attach the two velcro disks to the mask and to put the top piece of foam back in.Funnily enough I fixed the foam on three i4s and an events at the weekend with evostick contact adhesive
Did the Velcro tabs on one of the i4s too.
Works a treat.
Notes:
- always make sure you use glue that doesn't eat foam!
- It will say if it does on the box and always test it on a little bit before smothering the whole mask in it.
- remove lenses before glueing to prevent you from ruining lenses by accidentally sticking glue to them