![]() After a minimum of 16 hours, inspect for moisture, discoloration, or condensation on the concrete or the underside of the plastic. ![]() Test for moisture or dampness by taping the 4 edges of an 18 inch by 18 inch plastic sheet (4 mils thick) on the bare surface (an asphalt tile or other moisture impervious material will also do), sealing all of the edges. Moisture - (Reference ASTM D4263) Concrete must be free of moisture as much as possible (moisture seldom drops below 15% in concrete). The pH of the surface should be between 6 and 9. Cured is defined as concrete poured and aged at a material temperature of at least 75☏ for at least 30 days. The following guides will help assure maximum performance of the coating system and satisfactory coating adhesion to concrete:Ĭure - Concrete must be cured prior to coating application. ![]() The table below provides an overview of proper surface preparation for a variety of common substrates. Most coatings are now formulated for low temperature use. No exterior painting should be done immediately after a rain, during foggy weather, when rain is predicted, or when the temperature is below 50☏ - unless the coating indicates it can be used down to 35☏. Remove mildew, oil, dust, dirt, loose rust, peeling paint or other contamination to ensure good adhesion. The surface must be dry and in sound condition. The method of surface preparation depends on the substrate, the environment, and the expected life of the coating system.Įconomics and surface contamination (including its effect on the substrate) will also influence the selection of surface preparation methods. ![]() To ensure adhesion of the coating to the substrate and prolong the service life of the coating system, select and implement the proper surface preparation. Up to 80% of all coatings failures can be directly attributed to inadequate surface preparation, which affects coating adhesion. Improperly prepared surfaces can result in reduced coating integrity and service life. ![]()
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