I think Joe has a good product with Elmer's white glue. Don't use Elmers School Glue though because it is more like starch, not permanent glue. Don't use Gorilla, as it expands too much. I use somewhat diluted white glue or carpenters glue and an artist brush to reach under loose portions. A hypodermic syrenge can be used where the fabric is in bubbles. Place a piece of plain old kitchen- type, waxed paper over the glued area and weight with heavy books to assure a good bond, without sticking to the wrong thing.