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Clear water repellents are penetrating or film-forming coatings formulated to protect porous substrates by reducing the penetration of liquid water. Penetrating water repellents enter the pore structure of the substrate and deposit their water repellent component on the walls of the pores. Film-formers deposit their water repellent component on the surface of the substrate.
Clear water repellents are penetrating or film-forming coatings formulated to protect porous substrates by reducing the penetration of liquid water. Penetrating water repellents enter the pore structure of the substrate and deposit their water repellent component on the walls of the pores. Film-formers deposit their water repellent component on the surface of the substrate. Though sometimes called “sealers”, clear water repellents are protective treatments which do not seal treated surfaces to the transmission of water vapor. Clear water repellents permit the movement of water vapor while minimizing penetration of liquid water. Because it is virtually impossible to completely exclude water from a building under all conditions, this is an important distinction.
This paper will focus on the application of polymeric coatings and linings, which include, but are not limited to, polyamine and novolac epoxies and vinyl esters. These materials are delivered to the job site in buckets or bags and are mixed and applied on-site, and it is the responsibility of the owner, engineer and material supplier to determine the type of material and coating system to specify for any particular project.
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There is ongoing development of new technologies, designs, and construction practices that result in reduced energy use. Through development of these technologies and incorporation of them into Building Standards, the energy and water use and greenhouse gas emissions from these buildings will be substantially reduced. One of the compelling measures that will continue to be developed and expanded is the high efficiency improvements to the building envelope, including cool roofs and other measures to reduce the impact of solar gain on roofs and attics.
Galvanized mast arms support uncounted numbers of traffic signals and signage throughout the United States. The proportion of these that have a “duplex” coating system (both galvanizing and organic coatings) is unknown. However, the number is surely significant, and the number of coating system failures is also significant.