Frugal GM Quick Craft Tip: Working With "White Glue"
I'm a big proponent of using the right tool for the job and one of the most useful glues I have is plain old "white glue". You can water it down to get it to flow better, and to prevent it from forming a skin too quickly, which helps with flocking.
The thing I like best about "white glue", the thing that puts it above many other glues at times is that it doesn't have to be white. Simply color it with a few drops of acrylic paint and the glue can blend into the background.