On my last quilt, I was out of store-bought basting glue (and too lazy that day to run across town to buy some), so I tried this homemade recipe. The quilt was just shy of a twin size, and I used up about 3/4 of a batch. It worked out quite well, and I don't see myself buying any more basting spray now that I've discovered this handy recipe.
It does indeed spray on wet, as opposed to tacky, like the store bought basting sprays. For me, this was actually a huge plus. With the tacky sprays, I have trouble re-positioning my layers to get the way I want it. Because the homemade spray wasn't tacky, I could simply smooth things out with my hands to my heart's content, and then set it by pressing. I don't see myself buying any more basting spray now that I've discovered this handy recipe.
I did start quilting it immediately after it was pressed and cooled, so I can't vouch for how long the layers will remain adhered.