It's definitely a lubricant. See their old school ad campaign > Do you have tight nuts or a rusty tool? [0] [0] https://thedutchluthier.wordpress.com/2016/09

It's definitely a lubricant. See their old school ad campaign > Do you have tight nuts or a rusty tool? [0] [0] https://thedutchluthier.wordpress.com/2016/09/13/tight-nuts-or-a-rusty-tool/ https://thedutchluthier.wordpress.com/2016/09/13/tight-nuts-...