Asphalt sealants make the blacktop pavement not only look better, but also will make it last longer.
The reason for these effects is that the re-sealing of asphalt, say every three years, will protect the asphalt from sun’s ultraviolet rays, as well as water and ice.
Sun will deteriorate the outer layers of the pavement, exposing the aggregate and loosening the binder, and water/ice will deteriorate the composition of the compound as well, causing it to crumble over time.
Many opt to use asphalt maintenance companies for this purpose, because the materials sold to the contractors are often superior in quality to what you'd get from home repair stores.
This has been changing rapidly, however, as interest in doing the work by oneself has been increasing.
Home center and hardware stores typically have several types of asphalt sealant products available.
In bigger cities, you may even have access to sellers of professional-grade sealers and fillers, but they may sell only if you buy in large, wholesale quantities, typically in 55-gallon drums.
In contrast, the sealants sold in hardware stores typically come in 5-gallon buckets.
The hardware varieties are most often water-based emulsions that contain water, clay fillers, latex, polymers, additives and either coal tar or asphalt.
Of these, the coal tar products have been claimed to be the most popular, due to having more durability and resistance to oil or gasoline penetration.
In contrast, the asphalt-based sealcoating products are rapidly rising in popularity due to being much better for air quality due to not emitting high levels of volatile organic compounds (VOCs) like the petroleum-based products do. This also makes them smell better and they are less skin irritating.
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