wildebus
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For your van, I would think of screwing down with self-tappers as well as sticking, but very short screws just long enough to grab (there could well be wiring only just below). Do you know if your roof is a metal skin or plastic?Started cleaning roof
Plastic solar panel feet sticking them down with sikoflex 522 is it best to screew as well .
And seal the screews tops to.
Some say do both Some just stick.