I've never really found an acceptable solution to the annoying gap that shows above, below or to one side of a socket/switch after plasterboard wasn't cut just right to line up with the back boxes.
Unfortunately I have a significant number of sockets and switches with
1/4" gap that the face plates don't cover (builders error but probably better than I could have done)
In the past I've tried everything from grip-fill to attempting to filler the gap, filler being perhaps the least effective solution.
Anyone got any better ways that won't crack out?
Cheers - Pete