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SECTION 4 – SANITARY <br />65 <br />4-3.12 (c) APPLICATION OF REPAIR MATERIALS <br />1.) Repair materials shall be trowel, or spray applied, by utilizing proper equipment on to specified <br />surfaces. <br />2.) If using approved cementitious repair materials, such shall be troweled to provide a smooth <br />surface with an average profile equivalent to coarse sandpaper to optimally receive the <br />protective coating. No bugholes or honeycomb surfaces should remain after the final trowel <br />procedure of the repair mortar. <br />3.) The repair materials shall be permitted to cure according to manufacturer recommendat ions. <br />Curing compounds should not be used unless approved for compatibility with the specified <br />protective coating. <br />4.) Application of the repair materials, if not performed by the coating certified applicator, should <br />be inspected by the protective coating certified applicator to ensure proper finishing for <br />suitability to receive the specified coating. <br />5.) After abrasive blast and leak repair is performed, all surfaces shall be inspected for rem aining <br />laitance prior to protective coating application. Any evidence of remaining contamination or <br />laitance shall be removed by additional abrasive blast, shotblast, or other approved method. If <br />repair materials are used, refer to these specifications for surface preparation. Areas to be <br />coated must also be prepared in accordance with these specifications after receiving a <br />cementitious repair mortar and prior to application of the approved coating. <br />6.) All surfaces should be inspected during and after preparation as well as before the protective <br />coating is applied. <br />4-3.12 (d) APPLICATION OF PROTECTIVE COATING <br />1.) Application procedures shall conform to the recommendations of the protective coating <br />manufacturer, including material handling, mixing, environmental controls during application, <br />safety, and spray equipment. <br />2.) The spray equipment shall be specifically designed to accurately dispense a proper ratio and <br />application of the specified protective coating materials and shall be regularly maintained and <br />in proper working order. <br />3.) The protective coating material must be spray applied by a Certified Applicator of the <br />protective coating manufacturer. <br />4.) Specified surfaces shall be coated by spray application of a solvent-free, 100% solids, <br />polyurethane structural lining as further described herein. <br />5.) Airless spray application equipment approved by the coating manufacturer shall be used to <br />apply each coat of the protective coating. Air assisted spray application equipment may be <br />acceptable, especially for thinner coats [< ten (10) mils], only if the air source is filtered to <br />completely remove all oil and water.