I always thought that all Poly Vinyl Acetate (PVA) “white” glues were equivalent. Here in Canada the most common brand is LePage “Multi-purpose white glue”, while in the USA it is probably Elmer’s “Glue-All”.
I have both and was interested in which might be better for gluing ballast and scenery materials. To see if there was any obvious difference, I poured a small amount of each onto a plastic lid and let them dry. After one day, I was surprised to see a very marked difference between the two glues. You can see it in the photo.
Both were peeled off of the lid and flexed. The LePage immediately snapped in two, while the Elmer’s simply bent. I left them for a few more days to see if the Elmer’s would dry out some more and become brittle, but after many days it is still very flexible.
Exactly how this will affect their use as a scenery glue is not clear to me, but I would think that a little flexibility for scenery would be a good thing, so I’ll keep using Elmer’s as long as I can get it.