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Historic Preservation - Technical Procedures

Spectitle:
Stripping Paint From Ornamental Metal

Procedure code:
0570003R

Source:
National Capitol Region Specifications - Old Executive Off

Division:
Metals

Section:
Ornamental Metalwork

Last Modified:
02/24/2012

Details:
Stripping Paint From Ornamental Metal



STRIPPING PAINT FROM ORNAMENTAL METAL


BEFORE UNDERTAKING ANY PROJECT INVOLVING PAINT REMOVAL, APPLICABLE
STATE AND FEDERAL LAWS ON LEAD PAINT ABATEMENT AND DISPOSAL MUST
BE TAKEN INTO ACCOUNT AND CAREFULLY FOLLOWED.  STATE AND FEDERAL
REQUIREMENTS MAY AFFECT OPTIONS AVAILABLE TO OWNERS ON BOTH PAINT
REMOVAL AND REPAINTING.  THESE LAWS, AS WELL AS ANY REQUIREMENTS
PROHIBITING VOLATILE ORGANIC COMPOUNDS (VOCs), SHOULD BE REQUESTED
FROM THE STATE HISTORIC PRESERVATION OFFICER IN EACH STATE.  (From
Preservation Brief 28, "Painting Historic Interiors").  REGULATORY INFORMATION MAY
ALSO BE REQUESTED FROM THE ENVIRONMENTAL PROTECTION AGENCY (EPA)
REGIONAL OFFICE AND/OR THE STATE OFFICE OF ENVIRONMENTAL QUALITY.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on chemically cleaning
         and stripping paint from ornamental metal surfaces.  See
         also 05010-05-R, 05010-17-R and 05010-18-R for additional
         guidance on removing paint from metal.

    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).
   
1.02 QUALITY ASSURANCE

    A.   Mock-ups:  Demonstrate materials and methods to be used
         for cleaning, paint stripping, and polishing for each
         type of ornamental metal surface and condition on sample
         panels of approximately 9 square feet in area.  Test
         adjacent non-metallic materials for possible reaction
         with cleaning and paint stripping materials.

1.03 PROJECT/SITE CONDITIONS

    A.   Protect surrounding surfaces of building from damage
         resulting from ornamental metal restoration work.

    B.   Prevent chemical cleaning and paint stripping solutions
         from coming into contact with other surfaces which could
         be inured by such contact.

    C.   Dispose of by-products from cleaning and paint stripping
         operations by legal means and in manner which prevents
         damage to other surfaces.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   ProSoCo, Inc.
         755 Minnesota Avenue
         P.O. Box 1578
         Kansas City,  KS  66117
         800/255-4255 or 913/281-2700

2.02 MATERIALS

    A.   Chemical Paint Stripper: Thixotropic/alkaline formulation
         for removing paint coatings from ornamental metal work,
         such as "Sure Klean 509 Paint Stripper," (ProSoCo, Inc.),
         or approved equal.

    B.   Liquid Strippable Masking Agent: Liquid, film forming,
         strippable masking material for protecting glass, and
         polished stone surfaces from damaging effect of acidic
         and alkaline cleaners, such as "Sure Klean Acid Stop,"
         (ProSoCo, Inc.), or approved equal.

    C.   Water for Cleaning: Clean, potable, free of oils, acids,
         alkalis, salts, and organic matter.

    E.   Cleaning Pads: No. 4/0 fine steel wool or synthetic pads.

2.03 EQUIPMENT

    A.   Brushes: Fiber bristle only.


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:

         1.   Comply with recommendations of manufacturers of
              chemical cleaners and paint removers for protecting
              building surfaces from exposure to their products.

         2.   Protect glass, unpainted metal trim and polished
              stone from contact with acidic chemical cleaners by
              covering them with liquid strippable masking agent
              or polyethylene film and waterproof masking tape.
              Apply masking agent to comply with manufacturer's
              recommendations. Do not apply liquid masking agent
              to adjacent painted or porous surfaces, use
              waterproof masking tape.

         3.   Protect unpainted metal from contact with alkali
              chemical cleaners by covering them either with
              liquid strippable masking agent or polyethylene
              film and waterproof masking tape.

         4.   Remove cellophane tape, masking tape, etc., from
              ornamental metal surface prior to cleaning.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Brush all peeling and loose paint from surface using a
         stiff natural bristle brush. Do not use wire brushes.

    B.   Apply chemical paint stripper to painted surfaces with
         brushes.

    C.   Allow stripper to remain on surface for period
         recommended by paint stripper manufacturer.

    D.   Remove chemical and paint residue by sponge, cloth, or
         brush rinsing with water.

    E.   Repeat process as required to produce desired effect.

    F.   Wipe surface completely dry with clean soft cloths.

    G.   Prime all metal within two hours of stripping and
         cleaning.  See 05700-02-R for guidance on cleaning
         ornamental metal.  See 05010-13-S for information on
         paints and primers for use on metal.

                         END OF SECTION