Staple Gun...why not a nail gun?

 

dont waste your time with glue unless you get new foam and material. trust me ive done it three times and every time it fell a few days later. i finally quit trying and took the dam thing out. i dont have one now, it looks cool and chicks dig it!

 

I found this link on another mustang forum, from everything I have read the spray on adhesive is only going to be a temporary solution and eventually Im going to have to replace it.

Foxbody Headliner Replacement Guide