Sealcoating helps prevent oxidation and erosion of the asphalt and replaces fine particles lost from weather damage and wear-and-tear to the asphalt. It also resists gas, diesel fuel, oil, salt and chemical penetration which will break down the bond between the aggregate and the liquid asphalt. The intrusion of moisture into asphalt also accelerates its deterioration and is strongly related to asphalt distress making crack filling a maintenance must. Sealcoating and crack maintenance costs pennies a square foot compared to the dollars needed to repair or replace damaged asphalt.