Over time rubber-based seals lose their flexibility as a result of being in constant contact with oils, fuels, and additives. Wagner Oil-Stop is designed to make brittle seals a thing of the past. Wagner Oil-Stop combines a fully synthetic base oil with a plasticizer to restore the flexibility of rubber-based seals, increase their plasticity, and keep them smooth. Through continued use Wagner Oil-Stop keeps seals flexible and conditioned, greatly increasing their lifespan.