Hello together, I would like to attach a keder rail to my Vivaro to attach a sun sail there. I have already got through various alternatives with magnets and suction cups and it was not the truth. If the things actually hold at the end, I have the problem at the latest at the next strong rain that the water in the rain channel does not run fast enough and runs down at the side. In case of emergency then unfortunately also into the not completely closed sliding door. Therefore the decision to a permanently attached Keder rail above the sliding door. Basically I would attach the with Decalin or Sika (adhesive + dense) to the body and for additional hold metal screws turn in. I would take six screws at 3 m length. Is that enough? What do I have to consider when screwing into the sheet metal? Pre-drilling? Corrosion protection? Thank you already!