Lol yeah. Again I'm not knocking it for it's price tag. The Japanese nozzles all work perfectly without the goop. Can't say the same for every oring nozzle without a sealant I think the goop is an effort to keep paint out of the threads from the other side... Or simply hold it from rotating loose. The oring is a good indicator the brushes could be hit or miss and almost a certain indicator that replacing a nozzle could be hit or miss, otherwise they'd just eliminate it altogether. It's why it's only found on sparmax, neos, and Chinese brushes. Sparmax and neo both being a step above the Chinese imo. The Chinese brushes biggest two limiters in the heads being the tip of the nozzle wall is left quite thick and the aircap holes are just poorly straight drilled ..leaving a jagged , egg shaped hole under magnification.