The materials set forth in the following paragraphs are for painting of new steel; repainting of existing steel; the painting of steel components as designated on the Plans, in the Special Provisions, or as directed by the Engineer; and touch up painting of specified areas as directed by the Engineer. Materials for painting of galvanized steel and steel components shall also be as included below.
a) The procedure for painting of new steel structures after completion of necessary cleaning and surface preparation shall be to provide a shop applied primer, shop or field applied primer touch-up and field applied intermediate and topcoats all as set forth in this Special Provision unless specifically specified otherwise on the plans or elsewhere in the Special Provisions.
The procedure for repainting of existing, previously painted steel after completion of all repairs as shown on the Plans or as directed by the Engineer shall be to provide the specified cleaning, complete coating removal, and surface preparation and then field apply the primer, intermediate, and topcoat as set forth in this Special Provision unless specifically specified otherwise on the plans or elsewhere in the Special Provisions. All materials shall meet the requirements for the system specified.
b) New Steel and Existing Steel Requiring Total Coating Removal: the Contractor shall select one of the systems listed in NEPCOAT Qualified Products List B consisting of an Organic Zinc Rich Epoxy Primer, Epoxy Intermediate, and Aliphatic Urethane Finish. The system shall be fully approved by NEPCOAT. The VOC content shall comply with subsection 825.02.6 of this Special Provision, currently 340 grams/liter (2.84 lbs./gal) maximum. The Contractor shall provide a letter from the coating manufacturer that lists the system products and states that the VOC content is in compliance with this requirement.
The primer coat shall be applied to a total dry film thickness of 3 to 5 mils above the surface profile. A stripe coat of the primer shall be applied prior to the application of
the full coat for shop-painted steel. For field application of primer, the full coat may be applied prior to the primer stripe coat. Areas adjacent to each stripe coat may measure 2 to 3 mils heavier than the specified thickness.
The intermediate coat shall be applied to a dry film thickness (above the primer) of 3 to 5 mils, or a manufacturer’s specified dry film thickness, if greater than 3 to 5 mils. A stripe coat of the intermediate shall be applied prior to the application of the full coat for shop-painted steel. For field application of intermediate, the full coat may be applied prior to the primer stripe coat, but full and stripe coats shall be applied in the same order as the primer. Areas adjacent to each stripe coat may measure 2 to 3 mils heavier than the specified thickness.
The finish coat shall be applied to a dry film thickness (above the intermediate) of 2 to 4 mils or a manufacturer’s specified dry film thickness, if greater than 2 to 4 mils.
In addition to the above, the following material requirements have been established: 1. The primer shall provide a coefficient of friction of 0.33 (Class A) as determined
by NETPEP.
2. All paint shall be prepared at the factory ready for application. The addition of thinner or other material to the paint shall be permitted as recommended by the manufacturer and by permission of the Engineer, provided the coating complies with the VOC limitations at the time of application. Contractor shall furnish paint manufacturer’s certification that the paint complies with the paint system requirements specified.
3. The manufacturer shall provide a letter with the submittals that identifies the ranges for the material characteristics of the batches submitted for NTPEP testing (e.g., wet per gallon, solids by weight, solids by volume, viscosity, etc.). These ranges will be used as the acceptance criteria for subsequent laboratory analysis of jobsite material when directed by the Engineer. The manufacturer shall provide a letter with each batch of material supplied to the project that certifies that the material is the same composition as the material supplied for NTPEP testing.
4. Tinting - All tinting materials required shall be added to the paint at the time of paint manufacture. Field tinting shall not be allowed.
5. Mixing – Only materials that are within the stated shelf life shall be used. Complete kits shall be mixed unless otherwise authorized by the Engineer.
Mixing shall be in strict accordance with the manufacturer’s instructions and mixed material shall be used prior to the expiration of the pot life.
6. Precautions concerning the handling and storage of paint shall be shown on the label of paint and solvent. All storage shall be in accordance with the manufacturer’s instructions.
Alternate paint systems will not be considered. The Contractor is required to submit a certification with the bid proposal (on the form provided with these documents) as proof that the system included in the proposal and its bid price are based on the approved listed systems in Subsection 825.02.7(b).
d) Painting Galvanized Surfaces: If the galvanized surface is cleaned by abrasive blast cleaning, the full epoxy zinc/epoxy/urethane paint system as specified above shall be applied.
If the galvanized surface is not abrasive blast cleaned, a penetrating epoxy sealer that is compatible with the paint system shall be applied followed by the epoxy intermediate coat and the urethane topcoat as specified above. The epoxy sealer shall be provided to the Engineer for review and acceptance prior to use.
e) Submissions and Approvals: With the submittals, the Contractor shall provide to the Engineer the material characteristics of the tested paint system as stated in Subsection 825.02.7(b)-3.
Alternate paint systems will not be considered. The Contractor is required to submit a certification with the bid proposal (on the form provided with these documents) as a proof that the system included in the proposal and its bid price are based on the approved listed systems in Subsection 825.02.7(b).
825.03 CONSTRUCTION METHODS