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Does it work to mix Elmer’s glue with water and then brush on the sandy soil matrix?

About 5 years ago I took a trip out to the Green River Formation, found some nice Knightia and Diplomystus. This was long before I was on the forum, otherwise I would have made a post about it! Since then, I have found a number of shell fossils in Washington State where I live. Anyways, the commonality between them is that I coated them all in an Elmer's glue mix. This was before I knew about Butvar-76 and the like, which I still haven't bothered to try yet. The Green River Fossils consolidated well, but the shell fossils from the Lincoln Creek Formation slurped it up and didn't seem to be impacted in anyway whatsoever. My concern is that the Elmer's glue mix is going to age and yellow the fossils, or worse peel off and damage them. I want to have these fossils for a long time, and maybe even pass them on one day. Should I coat the fossils in something else to prevent this outcome? Would Butvar-76 work better as a consolidate for shell fossils in a flaky, sandy matrix? If it's going to work better and protect them better, I'm willing to pony up the money to have it shipped from England.

I'm a little confused. On the forums I have read a number of times (at least I thought I did) that Elmers school glue cannot be removed from a fossil, once it has dried. But just for the sake of experimenting, I coated a small rock in elmers glue and let it dry. After it sat in the warm sun for awhile and was good and dried, I put it in water. And almost immediately, the glue softened up and turned white and sticky again. I let it soak for awhile and then washed it off. The Elmers glue washed right off. Did I miss something? Or an I experimenting with the wrong kind of glue? I know Elmers glue is not very recommended for coating fossils, but I just got curious and wanted to experiment. :-) So if anybody can fill me in, that would be great!