Cork is one of the most incredible natural products available. U-40 cork sealer ensures that your cork grip will be protected from dirt and grime. Simply brush on a thin coat of cork sealer over a finished grip and the corks surface will repel staining. Because cork seal goes on with one coat and the coverage is very thin there is no noticeable difference in the feel of the grip. The sealer will darken the cork ever so slightly. It tends to bring out the natural richness of the cork without adding a slippery surface like tru-oil or other finishes. A must have for all rod builders.