Just read on another forum just now that a panel fitted 13 months ago using Sika without any mechanical fixings had let go on the motorway. This is just what I have been bleating on about for years warning it could happen on various forums. john
Pudsey, Darcar, Liberty Hall, Fifth Wheel and I have all been in discussions at another place some time ago on this very same subject!
My panel is well and truly belt and bracered using stainless steel high tensile nuts and bolts as well as good old Stixall that is specially spaced away from the roof of 'Millie' by 2 mm. so that this amazing stuff is at it's highest possible strength.
Many years ago in my former commercial days, I can well recall once driving underneath a fully loaded roof rack that had quite literally flown off the top of the car in front of me!!! Very shortly afterwards the smell was amazing!!!!