You need to laminate it with either sheet laminate (Oraguard 210) or various liquid or spray on laminates (Frog Juice
www.Superfrog.com).
For the sheet lam our Roland Printer cutter has a print, lam, cut procedure that contour cuts the graphic after you remove it and lam it.
It uses "targets" that it prints around the graphic to line it up after you put it back in after laminating it.
For the sheet laminate you need either a really big dedicated machine or a flat table and something like a Big Squeegee (that a brand name).