INSONO AF3 Primer is a water-based polymer emulsion primer. INSONO AF3 Primer is designed to improve the adhesion of INSONO AF3 self-adhered soundproofing membranes on most substrates when the use of solvent-based primers is not advised. The recommended substrates are concrete, plywood and gypsum boards.
Surface must be dry, clean and free of oil, grease, dirt or debris. INSONO AF3 Primer is applied via paint brush or roller. Apply the primer layer at a rate of 0.5 gal/100 ft2 (0.2 L/m2) with a thickness of 8 mils. Coverage rate may vary depending on the substrate. Allow INSONO AF3 Primer to dry 20 to 30 minutes prior to membrane application. Membranes must be installed on the same day as the INSONO AF3 Primer application. Drying time varies depending on surface and on environmental factors including relative humidity, win, ambient temperature and other factors. Minimum application temperature is 25°F (-4°C). Do not dilute INSONO AF3 Primer with water.