Hi Enoch
Yes sikaflex is very, very strong once set
If you have ever tried to remove a bonded windscreen, you'll know what I mean
Winscreen bonding is a type of PU adhesive with added UV protection but basically the same as Sikaflex.
If you are going to paint the scuttle !! Perhaps you could give some thought into using some countersink pop rivets to hold the alloy into place whilst the adhesive sets .... slightly over countersink them, skim of filler over the tops & the job will be a good'un
