Asphalt Knowledgebase | Protecting Your Blacktop
To understand why sealcoating works, it is necessary to understand the nature of asphalt pavement. Due to its excellent waterproofing, flexibility, and adhesive properties (which bind the aggregates in the pavement,) asphalt is used extensively for paving and road construction.
The strength of an asphalt pavement is directly related to the entirety of the pavement from the ground up. The black pavement we see is only the “roof” of the entire pavement. This roof covers a bed of graded stone aggregates of varying depths according to ground conditions and traffic requirements. This base of aggregate is what really carries the load of the traffic.