Can anyone recommend a good strong glue that isn't a liquid? I need to put it on a vertical surface but obviously don't want to have it all dribble down. I have no faith in Superglue - the only thing I've ever seen it stick is skin!
It's actually to mount my LPG control switch in position in the car. They're self-adhesive but for some reason this just won't stay stuck on. You can see what it's for here: