I use Elmer's washable school glue straight from the bottle. I use the little bottle. If the house is cool I sit it in a glass of warm water. I drizzle it on in a thin grid. I use it instead of pin basting not instead of spray basting. Meaning it doesn't have to cover the entire surface. I'm over 30 quilts in as big as queen size. I use my dining room table. No pool noodles or boards or tape. The glue is forgiving enough to reposition. It is so easy. Never a wrinkle in the batting. When it is dry it does not gum up the needle. It washes out every time. I haven't found a need to thin, spread, paint etc. but then again I don't have carpal tunnel/
wrist/shoulder/neck or back issues. I am able to standup and move around. So easy.