I just looked at the Elmer's web site. None of the spray adhesives (that I saw) were washable, as in wash out. They all mention fabric, but I'm guessing that it would be to mount fabric on poster board for display etc., or for other uses in craft projects. Normally when an adhesive is listed as "temporary or permanent" it's according to how much you use and how long you let the 2 surfaces bond. Eventually, the temporary will become permanent. I would not use it for basting.