Yes, Shoe GOO is water resistant as soon as it is applied. Shoe GOO should be applied directly to the surface to be sealed. Shoe GOO hardens by solvent evaporation, therefore allow for adequate hardening time to assure appropriate bonding and wear resistance. However, if you subject Shoe GOO-treated surfaces to excessive heat or sunlight they may not retain their water resistance. It is best to test any treatment for water resistance before use.