Thank you Paul.
I am 'customising' a resin/plastic model of a continental diesel - adding things like an etched exhaust grill, phosphor bronze handrails, white metal cast horns and tanks, etc.
My biggest concern is making these little things stay put - so that they do not fall off at the slightest knock.
I was going to use super-glue, but I am starting to think that epoxy might be better.
I used to associate epoxy with heavier, bigger tasks - but your post regarding the styrene balance weights made me think again.
Much obliged!