How did you apply the glue? With a paint brush?
I've never had problem diluting the glue...from a little to a lot
(when I was short on glue). I've had my quilt looks like a piece
of cardboard when I used a paint brush. Now I either "draw" the
glue making waves or grids but no more paint brush or rollers.
Then scrape any excess with my finger.
Leave it overnight. It might soften.