I use the washable glue to baste my sandwich and I NEVER pin.....I think I have tried all basting methods a nd washable glue is by far the cheapest, easiest, and best holding method I have found.....jyst sayin

I stick a few pins in the outer edges. That way you don't unpeel the spray basted quilt.

I do when I use my older machine, because I have to manipulate my quilt so much to get it under the small harp on my machine. It's alot of folding, puddling and tugging. But then I am a light sprayer anyway.

Not when I spray baste. 505 seems to work pretty good for me.

I use 505 also - no pinning at all. And I guess I'm just not very sensitive, but I use it inside all the time and have no issues with fumes or anything. I think I'm not sensitive, as my husband is always saying "Don't you smell that" about all kinds of things.

maminstl, I think the fumes are not healthy to breathe -- even if you can't smell them.

I don't pin when I use 505, and that is the only way I baste anymore.

Prism, no doubt you are correct. I make soap also and have learned to just hold my breath until I walk away from the lye fumes. I should probably do the the same thing with the 505.

I pin as others say around the edges just to ensure no catching backing. I use 505 as I have had no luck with elmer glue.
I think it is personnel choice.

I use basting spray so that I don't have to pin. If I it is going to take a lot of manipulation/time to quilt, I will sometimes tack around edges of blocks before machining - just so I am certain that it won't shift.