[Mr Modifier]

2 part epoxy is my glue of choice - great for chassis and motors as well as small body parts.  I do use superglue if the repair is between heats but it gives mixed results.

For loose spoilers when you do actually want them to come off in a crash - I use blu tack shoved into the holes.  Blu tack is also useful pushed in on top of body screws to stop them falling out if you have backed them off a bit too much.

Mind you I race digital so I usually don’t bother replacing wing mirrors - they will only be off again in a heat or two!!!