just taken delivery of fiamma f80s and fitting brackets for 2020 ducato pvc. Fitting instructions for brackets ( 3) show bead of sika 252 but also included are three selfadhesive rubber strips that match the area to be glued. The awning is held in place on the three lugs provided on the roof and sits on a rubber strip at the back. Does it need the sika 252 to safely secure it....any previous experience would be welcomed.