657Painting Galvanized and Aluminum Surfaces

(Last Revised May, 2018)

657-1DESCRIPTION. This work shall consist of painting galvanized and aluminum surfaces that have

not been previously painted.

657-2MATERIALS

657-2.01Paint for Use on Galvanized Surfaces. Material for this work shall meet the requirements of

§708-06 Paint for Galvanized Surfaces.

657-2.02Paint for Use on Aluminum Surfaces. Material for this work shall meet the requirements of

§708-07 Paint for Aluminum Surfaces.

657-2.03Paints

Engineer with one copy of the paint manufacturer’s current product data and safety data sheet for each coat to be applied. If manufacturer’s recommendations are more restrictive or require additional effort not defined in this specification, then the manufacturer’s recommendations shall be followed. 657-2.04 303 Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3

manufacturer’s recommendations. Paint will be considered in storage if it is onsite for more than 8 hours prior to application.

underlying substrate. The color of the topcoat shall be in accordance with the contract documents or defined by §708-05. A ‘Rustic’ color shall be Weathered Brown.

shall not be used. Paint arriving at the work site shall be in new, unopened containers and labeled with the manufacturer’s name, product name, component part, batch number, color, and date of manufacture.

657-2.04Water for Pressure Washing. Potable water shall be used

657-2.05Abrasive for Brush-Off Blasting Galvanizing Surfaces. Abrasive size shall range between 8

and 20 mils, and shall have a Mohs hardness of 5 or less. Steel grit, steel shot, or copper slag shall not be used.

657-2.06Paint Inspection Equipment. The Contractor shall ensure that the Engineer is supplied and

maintained with the following equipment in good working order, prior to the start of work:

“Solvent Cleaning”.

SP 16 “Brush-Off Blast Cleaning of Coated and Uncoated Galvanized Steel, Stainless Steels, and Non-Ferrous Metals”.

No. 2 ”Procedure for Determining Conformance to Dry Coating Thickness Requirements”.

Products.

Steel.

increments.

657-3.01 304 Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 All equipment will be returned to the Contractor upon completion of the work.

657-3CONSTRUCTION DETAILS

657-3.01Classification and Surface Preparation of Surfaces. A surface will be considered weathered

if the galvanizing has been uncoated and exposed to a well-ventilated environment for a minimum of two years. A surface will be considered new if it was galvanized less than two years ago.

equipment operating at a minimum pressure of 1450 psi, a water temperature of 185°F to 200°F, and a minimum flow of 4 gallons/minute. The nozzle shall be held at a distance of 6 inches to 12 inches from the surface. When the washing is completed, the cleaned surfaces shall be free of dust, dirt, oil and grease, animal waste, salts, and other debris. Oil and grease shall be removed by solvent cleaning as described in SSPC-SP 1. The areas shall be pressure washed again following this cleaning.

operating at a minimum pressure of 3000 psi, and a minimum flow of 4 gallons/minute. The nozzle shall be held at a distance of 6 inches to 12 inches from the surface. When the washing is completed, the cleaned surfaces shall be free of dust, dirt, oil and grease, animal waste, salts, and other debris. Oil and grease shall be removed by solvent cleaning as described in SSPC-SP 1. The areas shall be pressure washed again following this cleaning. Once cleaned and allowed to dry, all galvanized surfaces shall receive an abrasive brush-off blast per SSPC-SP 16, using clean compressed air. The Contractor shall verify the compressed air cleanliness with a white blotter test in accordance with ASTM D4285 at least once per shift. The brush-off blast shall remove zinc oxides from the galvanizing as well as etch the surface to impart an anchor profile of 1 to 1 ½ mils. The resultant anchor profile shall be confirmed by measuring using profile tape and a spring-loaded micrometer in accordance with ASTM D4417. The brush-off blast shall be performed in a manner that does not result in debonding or flaking of the galvanizing. The brush-off blast shall not remove excessive amounts of zinc from the galvanized surface. The initial thickness of the galvanizing prior to brush-off blasting shall be established using a magnetic thickness gauge in accordance with ASTM A123. If the brush-off blast results in a 15% or greater loss of galvanized coating, the article shall be rejected. If an article is rejected, the Contractor shall strip, re-galvanize and brush-off blast it to conform to the requirements of this specification at no additional cost to the State. After brush-off blasting, the galvanized surfaces shall be thoroughly blown down with clean compressed air to remove all blast residue. Any sharp, protruding defects in the galvanized surface such as that commonly found on edges and holes shall be removed using hand tools. Brush-off blasting shall be completed no more than 1 hour prior to paint application. If more than 1 hour elapses prior to priming, the galvanized surfaces shall be re-blasted at no additional cost to the State. If re-blasted, the item shall not have lost 15% or more of its original galvanized coating thickness.

operating at a minimum pressure of 3000 psi, and a minimum flow of 4 gallons/minute. The nozzle shall be held at a distance of 6 inches to 12 inches from the surface. When the washing is completed, the cleaned surfaces shall be free of dust, dirt, oil and grease, animal waste, salts, and other debris. Oil and grease shall be removed by solvent cleaning in accordance with SSPC-SP 1. The areas shall be pressure washed again following this cleaning. 657-3.02 305 Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 Once cleaned and allowed to dry, all aluminum surfaces shall receive an abrasive brush-off blast in accordance with SSPC-SP 16. All compressed air used to satisfy the requirements of this specification shall be clean. The cleanliness shall be verified with a white blotter test in accordance with ASTM D4285 at least once per shift. The brush-off blast shall remove aluminum oxides as well as etch the surface. The brush-off blast shall impart a minimum anchor profile of 1 mil as measured using profile tape and a spring- loaded micrometer in accordance with ASTM D4417. After brush-off blasting, the aluminum surfaces shall be thoroughly blown down with clean compressed air to remove all blast residue. Brush-off blasting shall be completed no more than 1 hour prior to paint application. If more than 1 hour elapses prior to priming, the aluminum surfaces shall be re-blasted at no additional cost to the State.

657-3.02Painting

greater than or equal to 40°F and rising, and less than or equal to 100°F. If the temperature range listed on the manufacturer’s product data sheet is more restrictive, the manufacturer’s temperature range shall be used. No paint shall be applied unless the receiving surface is absolutely dry. Paint shall not be applied when the relative humidity is more than 85% or the surface temperature is less than 5°F above the dew point. If the manufacturer’s requirements are more restrictive then they shall be followed. Paint shall not be applied if ambient conditions are expected to become unfavorable prior to the paint drying “To Handle”, in accordance with the manufacturer’s product data sheet.

manufacturer’s recommendations. After mixing, the bottom of the container shall be free of any unmixed pigment prior to use. The paint shall be periodically re-mixed if recommended by the manufacturer.

by the Engineer. The paint shall not be thinned where the resulting VOC level exceeds the maximum allowable limit set by 6 NYCRR Part 205 for industrial maintenance coatings. The manufacturer shall advise the Contractor and Engineer as to the maximum amount of thinner allowed. The Contractor shall not use unauthorized solvents and thinners, or excess amounts of solvents and thinners. Paint thinned excessively or incorrectly shall be removed at no additional cost to the State. The use of accelerator additives is prohibited.

inspected. The Contractor shall also provide sufficient time for the work to be inspected at each stage of paint application. The item(s) shall cure in an environment that is free of airborne dust and dirt until the paint is dry to handle. Paint may be applied using brush or roller, unless otherwise indicated by the contract documents. All paint shall be applied to produce a uniform, even coating free of runs, sags, drips, ridges or other defects. Areas exhibiting these defects shall be re-cleaned at no additional cost to the State. Brushes and rollers used to apply the paint must be of a quality to produce a smooth uniform coating and not leave fibers in the coating. The roller nap length shall be limited in accordance with the paint manufacturer’s recommendation. If the surface becomes contaminated before paint is applied, or if more than 1 hour elapses after brush-off blasting prior to priming, the surface preparation shall be redone at no additional cost to the State. 657-3.03 306 Section 600 STANDARD SPECIFICATIONS (USC) January 1, , 2026 VOLUME 3

thickness in accordance with the paint manufacturer’s product data sheet. The dry film thickness over galvanized steel shall be determined in accordance with SSPC-PA 2 using a Type 2 fixed-probe magnetic gauge. The gauge shall be properly calibrated over the galvanized steel surface in accordance with the manufacturer’s recommendation prior to paint application. The dry film thickness over aluminum surfaces will be estimated using a wet film thickness gauge. Areas failing to meet the specified minimum dry film thickness shall be overcoated with the same type of paint to produce the required dry film thickness. The overcoating shall be performed within the paint manufacturer’s specified recoat window.

657-3.03Repair of Damaged Areas. The Contractor shall remove all visible dirt, grease, and other

foreign matter by pressure washing and solvent cleaning in accordance with SSPC-SP 1 as needed. Areas exhibiting damaged or deteriorated paint not extending to the aluminum or zinc metal substrate shall be hand or power tool cleaned as necessary to remove damaged or deteriorated, loosely adhered paint, until the paint does not lift when scraped with a dull putty knife. All edges of paint surrounding the repair area shall be tightly adherent and feathered. These edges and the surrounding painted surfaces to receive a repair topcoat(s) shall be abraded to provide a suitable anchor profile for the paint. Areas that exhibit damage of the paint system down to the metal substrate shall be cleaned with vacuum-shrouded tools to SSPC-SP 16, minimizing zinc galvanizing removal, and shall exhibit a suitable anchor profile for the primer paint. All surrounding structure that has been previously painted in the shop shall be protected from damage during the cleaning operation. Repairs shall be smoothly transitioned into surrounding new paint. Areas of the structure exhibiting damage not extending down to the metal substrate shall be repainted with a finish coat only. Damage extending to the metal substrate shall be repainted with primer and finish coat. These coats of paint shall be applied at a dry film thickness as recommended by the paint manufacturer for such repair application.

657-4METHOD OF MEASUREMENT. The unit of measurement for this work is lump sum

657-5BASIS OF PAYMENT. The unit price bid shall include the cost of all labor, materials, and

equipment necessary to satisfactorily complete the work.

657-5.01Progress Payments. Progress payments will be made based on the ratio of area cleaned and

painted to the total area to be painted as described in the contract documents. Payment will be made under: Item No. Item Pay Unit

657.01nnnn Painting Weathered Galvanized Surfaces Lump Sum

657.02nnnn Painting Newly Galvanized Surfaces Lump Sum

657.03nnnn Painting Aluminum Surfaces Lump Sum

*nnnn Serialized number identified structure detailed in contract documents.