Asphalt seal coating is important because although asphalt has great waterproofing and adhesive properties, it also has some rather serious flaws that relate to its chemical makeup which provides easy access to weather, salts, and chemicals that destroy the asphalt molecules.
As these molecules are destroyed, asphalt will lose much of its original properties, such as waterproofing and binding. The first visual sign of this is a change in color from black to brown to gray. You can browse https://www.joemcasphaltservices.com/sealcoating/ to get more info on asphalt seal coating.
As asphalt is a byproduct of petroleum distillation processes, it is easily dissolved by the many other products that are also derived from petroleum.
This is because these individual items come from the same source, and therefore have a natural affinity for each other and will try to rejoin when put together again. Therefore, oil and gasoline both work to easily dissolve asphalt, which contains many very similar chemicals.
This problem is normally only seen in off-street, low traffic pavements such as driveways or minor streets; places where the oil and gasoline have a chance to sit and soak in.
Asphalt seal coating can resist these other substances and keep these chemicals from interacting, therefore extending the life of the asphalt and preventing the need for excessive, expensive repairs and patching.
If your asphalt does need to be repaired, however, be sure to do it quickly as no seal coating can protect the asphalt from water and other elements once the surface itself is cracked.