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10. Omit the field prime coat on shop -primed and touch-up painted metal surfaces which are <br />not to be finish painted and which will not be exposed to view in the completed work. <br />Do not omit primer on metal surfaces specified to be finish coated or on metal surfaces <br />that will be exposed to view in the completed work. <br />11. Putty nail holes and joints after prime coat is dry. <br />12. Change colors at comer of stop where colors differ between adjoining rooms or spaces <br />and where door frames match wall colors. <br />13. Provide a finished coating system free of all runs, sags, cracks, blisters, pinholes, <br />excessive or deficient fill thickness, or any other defects. Correct any such deficiencies <br />by proper removal of the defect and/or recoating. <br />14. Apply the first -coat material to surfaces that have been cleaned, pretreated or otherwise <br />prepared for painting as soon as practicable after preparation and before subsequent <br />surface deterioration. Sandblasted surfaces are not to be left uncoated overnight. <br />15. Allow sufficient time between successive coatings to permit proper drying. Do not recoat <br />until paint has dried to where it feels firm, does not deform or feel sticky under moderate <br />thumb pressure, and the application of another coat of paint does not cause lifting or loss <br />of adhesion of the undercoat. <br />16. Provide minor tinting to each coat of paint in order to differentiate between coats. <br />B. Minimum Coating Thickness <br />1. Apply each material at not less than the manufacturer's recommended spreading rate, to <br />establish a total dry film thickness as specified or, if not specified, as recommended by <br />the coating manufacturer. <br />C. Painting of Mechanical and Electrical Work <br />Limit painting of mechanical and electrical work to those items exposed in equipment rooms and <br />occupied spaces, and on the exterior of buildings or structures. <br />1. Mechanical items to be painted include, but are not limited to, the following: <br />a. Piping, pipe hangers, and supports <br />b. Heat exchangers <br />C. Tanks <br />d. Ductwork and insulation <br />e. Motor mechanical equipment and supports <br />f. Accessory items <br />D. Prime Coats <br />1. Apply a prime coat of material, which is required to be painted or finished, and which has <br />not been prime coated by others. <br />044572017 <br />09900-10 <br />