Asphalt seal coating is essential because even though asphalt has great waterproofing and adhesive properties, it has some flaws to its chemical makeup which allows salts, chemical substances and weather elements to penetrate and destroy the asphalt molecules. As these molecules are destroyed, asphalt will shed a great deal 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. As asphalt is really a byproduct of petroleum distillation processes, it is easily dissolved by other materials that are also derived from petroleum. This is because these individual substances come from the same source, and have a tendency to bind when they are mix together. Consequently, oil and gasoline can dissolve asphalt effortlessly because they have similar chemical compositions.
This is normally an issue in off-street, low traffic pavements such as driveways, parking lots or minor streets, where oil and gasoline have a chance to sit and soak in the asphalt. Asphalt seal coating can resist these substances and prevent them from interacting, and as a result, extend the life of the asphalt and stop the need for excessive, pricey repairs and patching. If your asphalt does need to be repaired, make sure to do it rapidly as no seal coating can shield the asphalt from water and other components once the surface has cracked. Although cracks are easy to repair, they do have a tendency to come back. It is better and cheaper to patch and fill them as soon as possible than to wait and allow more damage to occur and have to re-lay the whole area, which is definitely more expensive.
However, contrary to popular belief, asphalt doesn’t need to be re-coated yearly. Re-coating too frequently can trigger issues, like peeling at about the ten year mark. You also need to be cautious and wise when choosing a contractor to do the job of asphalt seal coating. Customers are not usually aware of the process, and unscrupulous service providers are taking advantage of them. Common practices consist of diluting the sealant, making it completely ineffective. Be sure that you’re hiring a company that has a good reputation, certified and trustworthy.