Recommended adhesive for rear lens cover?

[itm]

I've bought a replacement lens cover for the rear camera on my V20. It came with self-adhesive, but the adhesive isn't good enough and it keeps falling off. I really don't want to use superglue to secure it. Can anyone recommend a good alternative which will keep it in place, but which won't be a pain in the neck if the lens cover gets smashed again and needs to be replaced?