Just a LIGHT smear, nothing more. I use a very light smear of copper grease - haven't lost a wheel yet! Don't automatically look to dis the previous owner, it may not necessarily be their fault, some if not most garages will use an air gun to tighten wheel nuts then use a torque wrench (if you're lucky), but the nuts will already be miles past the correct setting. They should use a very light setting, then use the torque wrench to finally tighten to the correct torque.
Having investigated many truck wheel loss incidents garages are very poor in wheel security.
Brilliant Blue 156 GTA SportWagon | Q2 | KW V1 Coil-overs | Eibach ARB | Wiecher Strut Bar | Wizard Cat-Back
2009 Fiat Panda 100 HP Stealth Edition