which glue is best for bodywork stuff-
eg sticking tadpole bead to rear arches?
anything in BnQ??

You don't need it, just trap it between the mating surfaces. The ridging on the tadpole beading should stop it sliding out. That's how we did our's and it's not moved.

Did you cut 'darts' in the flat bit, to give a more even bend?

or just cram it in ??

Yeah we did cut "darts" into it... not that I'm a qualified dressmaker you understand... they need to be cut every inch or so right upto to bead to avoid the beading looking like a three-penny bit!

Where it goes over a bolt/stud/rivet location, we cut a hole for the item to go through rather than around, to prevent it from sliding out. It's a little bit fiddly but once it's done it looks well.

Good luck!