Good lubricant for assembly

Postscript: I don't recommend petroleum based lubricants because of the potential problem if they permeate into the composite structure. There is a reason composite layups are done while wearing latex or nitrile gloves (as well as handling Fiberglass, Kevlar or Carbon Fiber cloth). Sure, they keep the goo off your hands, but they also prevent skin oils from contaminating the fibers and epoxy.

I am sure some folks will disagree, but the FRP engineers I know all wear gloves, never handle cloth with bare hands and don't use petroleum based lubricants on any composite structures.