>>10760266Bought it off eBay on a friends recommendation, appears to be a coom colored liquid based varnish. You could probably buy something similar in bulk at an art/hardware store if you want to cheap out but I can verify this particular brand wont damage figures. Its odorless, easily washed/wiped off, gets deep into hinges and adds solid friction as advertised. Its essentially the nail polish trick some people use for loose ball/peg joints but way cleaner and also useable for hinge joints.
Ive never used it on a Figma hinge joint since they are normally never ever loose.
I have used this to tighten my Yukari and Lynette Bishops shoulder ball joints that were getting floppy, to tighten Cliffs neck joint so he stopped doing the incel neck tilt and to fix a floppy knee on one of my dragon horse Scp bucks. very glad for that last one since it was a figure ruining issue.