This specially formulated sealant is ideal for fixing or preventing leakage from failing o-rings and rubber gaskets. The high viscosity compound ensures excellent adhesion to further enhance seal integrity. It’s rich silicone content also keeps rubber components supple for a longer service life. When applied in pressurized areas such as GBB magazines, 4UANTUM SEAL will penetrate and fill unevenness between valve seals to help the magazines hold a full charge over a longer time.