Be real careful... I would recommend against super glue (CA glue). When i've used that before it leaks out and causes a permanent stain... even when being careful. I think applying with a brush is a good idea as that will limit the amount of glue deposited. even a small drop of glue will spread out quite a bit. Maybe if they have glue that's in a pen that's a good idea? Like a paint marker but with glue?