In terms of substrates, coatings are available in two types: all-purpose, which can be used on a variety of substrates, and application-specific, which are formulated for use with a particular substrate or a narrow range.
It’s important to consider the materials that make up your roof when choosing a roof coating. After all, the chemical process of adhesion involves both surfaces, the coating and the substrate. Generally speaking, coatings will adhere less well to roofs that are smooth, hard, and composed of chemically inert compounds. Surfaces that are irregular, rough, and chemically active will bond with a coating more readily and thoroughly.
The adhesive bond between a coating and a roof can be strengthened with an appropriate base coat. It’s important to follow the coating manufacturer’s guidance when selecting a primer. For example, primers and base coats customized for built-up roofs are designed to bond with dark-colored – and therefore hot — asphalt and prevent it from combining with the coating itself, which is usually white.
A roof coating can significantly lengthen the useful life of a commercial roof, but it’s only possible to achieve the beneficial effects by choosing the right coating for your individual roof, along with the primer or base coat that will help the coating work. Professional roofing contractors and technicians will have experience with applying different types of coatings correctly and consistently, as well as accounting for uncontrollable external factors like bad weather that can affect the success of your installation. If you want to learn more about the coatings that are most appropriate for your roof or have any other questions about roof coatings, we at Energy Seal will be happy to help you.