when i vinly a box, i will round over the edges slightly, then on 2 sides when building box sink sides in 1/4 inch, make 1/4 panels to fit, the cover them and incert, looks good, Dap contact cement works good, but you have to spray it will a glue gun,on both pieces let dry to touch then stick, better havr it where you want it, because if it is wrong, you cant save the vinyl.