I spray baste all my quilts. I use 505 spray. I never pin. Sometimes the quilts sit for weeks (a couple - months-years) Occasionally on an old one I respray just the corners.
I will never go back to pinning.
I am fortunate that I have keys to our church and can go over and push tables together to baste. That and I have friends to help me. Never have to get on the floor (not sure i could get up if I did)
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My newest Grandson, Caleb Austin, was born May 29th. I am now Grandma to 4 precious babies. I am so blessed!!!!