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Historic Preservation - Technical Procedures

Spectitle:

Removing Graffiti From "Incralac" Coated Bronze

Procedure code:

0501003R

Source:

Outdoor Sculpture Manual - Center For Public Buildings

Division:

Metals

Section:

Metal Materials

Last Modified:

02/24/2012

Details:

Removing Graffiti From "Incralac" Coated Bronze



REMOVING GRAFFITI FROM "INCRALA= C" COATED BRONZE


THE CLEANING OR STRIPPING OF METALS MAY INVOLVE THE USE OF
ABRASIVES, LIQUIDS OR SOLVENTS WHICH MAY SPLASH OR RUN OFF ONTO
ADJACENT MATERIALS.  TAKE SPECIAL CARE TO PROTECT ALL ADJACENT
MATERIALS, AND DO NOT USE THIS PROCEDURE ON METALS OTHER THAN
THOSE SPECIFIED IN THE SUMMARY.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing ink or paint
         based graffiti from "Incralac" coated bronze using a
         solvent.  If this protective coating is removed in the
         process, it may be reapplied (see 05010-= 11-R "Repairing
         a Scratched or Worn Incralac Coating on Bronze").

    B.   Safety Precautions:

         1.   DO NOT save unused portions of stain-removal
              materials.

         2.   DO NOT store any chemicals in unmarked containers.

         3.   EXCELLENT VENTILATION MUST BE PROVIDED WHEREVER ANY
              SOLVENT IS USED.  USE RESPIRATORS WITH SOLVENT
              FILTERS.

         4.   No use of organic solvents indoors should be
              allowed without substanti= al air movement.  Use only
              spark-proof fans near operations involving
              flammable liquids.

         5.   Provide adequate clothing and protective gear where
              the chemicals are indicat= ed to be dangerous.

         6.   Have available antidote and accident treatment
                             chemicals where noted.=0C     C.   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 Precaution= s

         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).

    D.   For general information on the characteristics, uses and
         problems associated with bronze, see 05010-03-S.


PART 2---PRODUCTS

2.01 MATERIALS

    NOTE:  Chemical products are sometimes sold under a common
    name.  This usually means that the substance is not as pure as
    the same chemical sold under its chemical name.  The grade of
    purity of common name substances, however, is usually adequa= te
    for stain removal work, and these products should be purchas= ed
    when available, as they tend to be less expensive.  Com= mon
    names are indicated below by an asterisk (*).

    A.   Acetone (C3H6O):

         1.   A volatile fragrant flammable liquid ketone used
              chiefly as a solvent and in organic synthesis and
              found abnormally in urine= .

         2.   Other chemical or common names include Dimethyl
              ketone; Propanone

         3.   Potential Hazards:  VOLAT= ILE AND FLAMMABLE SOLVENT

         4.   Available from chemical supply house, hardware
              store, or from manufactur= ing company such as Fisher
              Scientific Co., or approv= ed equal

         IMPORTANT:  NOTE FIRE AND SAFETY PRECAUTIONS IN HANDLING
         THIS SOLVENT.

    B.   Absorbent cotton

    C.   Incralac, spray can or solution for application with a
         spray gun

    D.   Rags, clean soft, lint free, unsized, (such as old T-shirts or toweling)

    E.   Paper towels, lint free, such as Kimwipes (Fisher<= br>          Scientific)

    F.   Wax and pigment under "Waxing" (see 05010-05-P "Applying
         Paste Wax Over Incralac Coated Bronze)
2.02 EQUIPMENT

    A.   Tweezers

    B.   Spray bottles

    C.   Goggles or glasses

    D.   Stencil brushes, 1/2 inch diameter brush end, unpainted
         wood handle, white tampico fiber, metal ferrule.  These
         are available at most art supply stores.=

    E.   Polygloves, disposable polyethylene gloves or neoprene
         rubber gloves, both of which will not be dissolved by
         organic solvents.


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:  Provide adequate wash solutions (i.e. water,
         soap and towels) before starting the job.

3.02 ERECTION, INSTALLATION, APPLICATION

    NOTE:  DO NOT TRY MORE THAN ONE TREATMENT ON A GIVEN AREA
    UNLESS THE CHEMICALS USED FROM PRIOR TREATMENT HAVE BEEN
    WASHED AWAY.

    A.   Apply acetone with the small stencil brushes or cotton
         held with tweezers.  Limit applicat= ion of solvent only to
         substance to be removed.  Contain all drips with the
         clean rags or paper towels to avoid the unnecessary
         spreading of the ink or paint.

         CAUTION:  AVOID INHALATION OF SOLVE= NT VAPOR.  KEEP TOPS
         ON SOLVENT BOTTLES AS MUCH AS POSSIBLE.  PROTECT HANDS
         WITH GLOVES, AND EYES WITH GOGGLES OR GLASSES.

    B.   Work in small areas at a time, completely removing the
         graffiti material in one area before moving on to the
         next.

    C.   When the graffiti has been removed, retouch the Incralac
         coating with one or two spray applicatio= ns (see 05010-11-R).

    D.   When the coating is dry, wax, either pigmented or
         unpigmented, as required, may be applied to adjust
         surface color and degree or gloss (see 05010-05-P
         "Applying Paste Wax Over Incralac Coated Bronze).

                         END OF SECTION