Rosin sealant is an sticky product used for a secure yet easily reversible hold on threaded connections, ideally suited for work on Sheaffer PFMs, Snorkels, Parker Vacumatics, and Parker 51s as well as many others. The reversible hold is the result of the relatively low melting temperature when compared to shellac. Place a very small amount (these small jars are adequate for many pens) on the threads, heat and screw in the parts. When it is time to separate them simply heat and unscrew.
5ml (~0.17 fl. oz.)