I just did glue basting on the last two projects. One was fine and one I had to take out some quilting I didn't like. Oh my, it was a few picked stitches at a time. That was a pain!
I used glue right from the bottle and a wide chop stick to flatten out any lumps.
First glued the back and batting in quadrants. Smooth and iron each section to hold together. Then the front and batting were done. Again in sections and ironed smooth.