ORIGINAL: vertical grimmace
Ok, this is absolutely not true. RC 56 is canopy glue. I think RC 56 is made by Pacer. It dries clear and is flexible. Elmers (PVA) dries much too stiff for this purpose. It is similar, but not the same. Now that you know the name, finding it should be easy.
No you are quite wrong.
I didn't believe it either. Someone else made this assertion here some time ago which I highly doubted.
I said the same as you too at the time, so I decided to research it a bit to test his assertion.
Much to my surprise I found that he was absolutely correct.
I found a PDF file online from the glue manufacturer ( Pacer ) given to the English Government's health division. It was produced for toxilogical reporting purposes in England so Pacer could sell Canopy Glue there...
It listed the chemicals, percentages, etc... in great detail. I compared it against the white glue fomulations.
Canopy Glue is nothing more than "white glue" in a slightly thinner mix.
Gorish: White glue doesn't dry with a yellowish cast. Were you using a different glue... e.g. a wood type white glue?