On Saturday, May 26, 2018 at 8:34:36 AM UTC-5, Senna Van den Bosch wrote:
I'm trying to find a good lubricant for assembly, available in Europe. Any ideas? Currently using regular vaseline.

No additional facts for metals: fretting corrosion is important..
But.. for the carbon-fiber/epoxy pieces...
I was given very bad advice when I bought my glider in 2000 - "lubricate everything"! and used a light petroleum-based spray on the carbon parts. They grew! After carefully re-sizing them with 1000-grit paper, I switched first to high-pressure spray-on graphite lube for a few years. Works nicely to let the carbon parts slide without binding, but marks up everything. Then I switched to a wax lubricant, which does the same job without black or grease. The wing extension pins are the key point here.