Conventional Coal Tar
A pavement that has been sealed with a coal tar sealer is impervious to gas and oil. This means that the deterioration process caused by fuel and oil spills will be severely curtailed as well as weather damage caused by wind and water.
Coal tar sealer is also impervious to the sun’s ultraviolet rays which dry out the pavement causing it to ravel and lose its flexibility. When mixed properly with 4-6 pounds of sand per gallon (for added strength and skid resistance) and latex modifiers (for elasticity), the coating will last on your parking lot for many years, when installed by trained professionals.
- The weather needs to be warm and dry.
- The temperature should be 50° and rising with no rain in the forecast.
- Nighttime temperatures should not be below 32° F.
- The sealcoat material should be mixed in a large tank with a full sweep agitation system which will keep the mixture of coal tar sealer, sand, latex modifier and water at the proper consistency.
- The asphalt surface must be cleaned with a combination of power brooms, power air blowers and hand tools.
- All dirt and debris must be removed from the asphalt surface.
- Fresh oil spots should be treated with a primer to ensure sealer adhesion.
- Large cracks should be filled with a rubberized crack sealant.
- The sealer is then “cut in” by hand around the edges of buildings, curbs and other non-asphalt surfaces to prevent overspray.
- The sealer is then applied to the remainder of the parking lot in two separate coats. The second coat is applied after the first coat has dried.
- Pavement markings can be applied as soon as the coating is dry using a heavy- duty traffic paint.
- Traffic can be introduced to the lot in 12 – 24 hours based on climate conditions.