While you can’t prevent oxidation – the deterioration of the asphalt binder resulting from exposure to the air and the sun’s ultra-violet rays – timely sealcoating slows it. Colorado’s weather is extremely harsh on parking lots and driveways. This is due mostly to our altitude and extreme changes in temperature. Oxidation causes the pavement to become brittle, makes it easier for cracks to occur and to grow more quickly, and enables other deterioration as well. Applying sealer to the pavement surface adds a layer of protection on top of that asphalt binder so it’s the sealer that takes the exposure to air and sun and not the binder itself. Regular application of sealer – generally every two or three years depending on region and traffic flow – will extend the life of your pavement.