I don' think rubber cement washes out. Elmers school glue most definely washes out. I've been using it for more than 2 years and it is one of the best (tools of the trade) so to speak. Makes binding a quilt a pleasure instead of the dread of being stuck by pins as you are hand stitching the binding to the back. Also don't have to worry about lost pins in the carpet or furniture. I give credit to Sharon Schambers each time I show another person how nice your binding will look with her method.
good luck
Suzy