Stripping And Repainting Iron And Steel Features

Procedure code:
National Capitol Region Specifications - Agriculture Bldg
Metal Materials
Last Modified:




    A.   This procedure includes guidance on stripping iron and
         steel of all paint build-up and repainting.

    B.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure. These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed, when applicable,
         along with recommendations from the Regional Historic
         Preservation Officer (RHPO).



    A.   The Benjamin Moore Co.
    B.   Devcon Corporation

    C.   The Sherwin Williams Co.


    A.   Metal Filler: Steel filled, two part, epoxy, metal
         filler, putty grade such as "Plastic Steel" (Devcon
         Corporation), or approved equal.

    B.   Paint for Metal: Alkyd resin, (Benjamin Moore), (Sherwin
         Williams), or approved equal, designed specifically for
         exterior metal application. Paint products shall be fresh
         and well-ground; shall not settle readily, cake or
         thicken in the container; shall be broken up readily with
         a paddle to a smooth consistency and shall have easy
         application properties. Other painting materials such as
         linseed oil, turpentine, mineral spirits, and
         miscellaneous thickeners, shall be of the highest quality
         and of an approved manufacturer.  See also 05010-13-S for
         additional guidance on primers and paints for steel.

         1.   Primer: Compatible with top coats of paint; make
              each coat clearly different in color.

         2.   Base and Finish: Alkyd resin semi-gloss: Benjamin
              Moore or Sherwin Williams; make colors clearly
              different from each other and primer.

         3.   Dry Film Thickness:

              a.   Primer: 2 mils.

              b.   Base and Finish Coats: 2 mils each.

    C.   Sealant Backer Rod: Polyethylene compressible rod, 50%
         larger in diameter than the joint.

    D.   Sealant: Polyurethane sealant, color to match masonry.


    A.   Wire Brush: Non-ferrous metal brush such as brass.

    B.   Dry Grit Blasting: Fine grit at 80-100 psi.

    C.   Paint brushes



    A.   Protection:

         1.   Enclose dry-grit blasting work areas with temporary
              scaffolding or framework sufficient to support
              tarpaulin enclosure to prevent escape of abrasive.

         2.   Shield adjacent masonry and glass with a temporary
              covering of cardboard or fiberboard held in place
              with heavy-duty strapping tape or wood bracing.
              Use drop cloths or other suitable coverings as
              appropriate to protect materials from paint drips
              and splatters.

    B.   Surface Preparation:

         1.   Determine that surfaces to which paint is to be
              applied are even, smooth, sound, clean, dry and
              free from defects affecting proper application.
              Correct or report defective surfaces to Contracting

         2.   Execute all painting in a temperature range of 50
              - 85 F, at a relative humidity below 60%. Do not
              apply paint on surface in direct sunlight or in
              spaces where dust is being generated which would
              speck the finish.


    A.   Remove all paint to bare metal from iron and steel
         surfaces using mechanical methods such as scraping,
         sanding or dry grit blasting.  See also 05010-05-R for
         additional guidance on paint removal from steel.

    B.   Remove dirt and grease and abrade remainder of the
         surface with wire brushing. Remove residual grit from all
         surfaces by air blasting.

    C.   Seal all open joints between metal elements and masonry
         with backer rods and sealant. Joint shall be concave with
         smooth finish. Do not allow sealant to extend over the
         edges of the metal or the face of the stone.

    D.   Replace or repair any badly deteriorated pieces of
         metalwork to match the original.

    E.   Fill small holes, depressions and cracks with metal
         filler following the manufacturer's  written directions.
         Finish all filled areas by sanding flush, after curing
         time has elapsed.  

    D.   Prime all metal within two hours of cleaning, down to
         bare metal using a color obviously different from the
         finish color.

    F.   Paint to match color specified by the RHPO.

         1.   Brush-apply material evenly without runs, sags, or
              other defects. Work each coat onto the material
              being coated at an average rate of coverage
              recommended in manufacturer's printed instructions.

         2.   Cover surfaces completely to provide uniform color
              and appearance with a minimum of dry, film
              thickness of 2 mils.

         3.   Make edges of paint, adjoining other materials or
              colors, sharp and clean and without overlaps.

         4.   Apply additional coats when undercoats, stains, or
              other conditions show through final coat of paint,
              until paint film is of uniform finish, color and
              appearance.  Insure that corners, edges, crevices
              and exposed fasteners receive a dry film thickness
              equal to that of flat surfaces.

         5.   Each coat of paint is to be slightly darker than
              the preceding coat with the final coat exactly
              matching the accepted samples.

    G.   Drying Time: Minimum time, as recommended. Do not apply
         subsequent coats until the undercoat is thoroughly dry.
         Sand between coats to produce even and smooth surfaces.


    A.   Remove all paint where it has spilled or spattered. Do
         not drip any paint on stone. Use paint thinner or solvent
         as necessary to effect complete removal.

                         END OF SECTION

Last Reviewed 2017-01-24