my manual hubs come off everytime i change oil, or rotate tyres, about every 5000KM or so, and i just do them up tight, sometimes if i feel like it, i use the tube gasket maker thing, but only so it seals a bit better. water gets in through the switch anyway.
i just do them up tight, and she's all go. do over tighten, or you'll just strip the bolt and have a nice time trying to get it off. (experience)