Seal Coating Specs

Surface Preparation

• Clear the pavement of all debris and make sure the pavement is dry so that the seal coat properly adheres to the foundational asphalt. "Cleaning may be by air blower, vacuum, mechanical sweeper, washing or other techniques as approved by the engineer" according to the ASMA website. Improper preparation of the surface can result in a failure of the seal coat adhesion.

Application

• Sealcoating may only be applied by manufacturer and engineer approved methods. These include mechanical means as well as rubber squeegee tools, brooms and scraping tools. Application must be smooth and without pits or lumps. Normal applications usually call for two coats, but more may be applied at the engineer's discretion. Additionally, when temperatures exceed 80 degrees Fahrenheit, water mist may be required to successfully apply the seal coat.

Product Storage and Job-Site Delivery

• Sealcoat products must be stored in temperature insulated tanks designed to provide constant agitation to prevent them from congealing. In addition, according to PavementPro, "Sealer manufacturers always supply sealer --- whether asphalt or refined coal tar --- in a concentrated form that has to be diluted 25% to 30% by volume with water and mixed with sand or aggregate for proper textured appearance and non-slip properties."