I removed the glass from a large boat compass to clean it [it was clouded up] and most of the fluid was gone,and did not work well. What kind of fluid could i fill it with? Would Prestone anti freeze work?
The best fluid to use for any compass, old or new, is purified kerosene. Purified kerosene is transparent, has low-volatility, does not damage painted surfaces or mother-of-pearl dials, is gentle on rubber and silicone gaskets and seals, and ideal for all compasses.