GSA Mobile

REMOVING GLUE AND TAR STAINS FROM GRANITE


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on the removing of glue
         and tar stains from granite.

    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).

    C.   For precautions relating to pressure cleaning, see 04510-04-S.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.  Prosoco, Inc.
         www.prosoco.com
         

2.02 MATERIALS

    A.  A compound with dibasic ester and other chemicals manufactured

        for the removal of graffiti marks from masonry such as "Defacer Eraser

        Graffiti Wipe" (Prosoco), or equal, as a first step.

  B.   If the above is not effective, then thixothropic paint removing compound
         composed of methylene chloride and other chemicals formulated for removing spray paint,             tar or adhesives from stone masonry such as "Sure Klean Fast Acting Stripper" (Prosoco),          or approved equal.

    B.   Clean, potable water

2.03 EQUIPMENT

    A.   Low-pressure water equipment (measuring between 100 psi
         and 400 psi)

    B.   Fan-type spray tips (15 degree fan spray)

    C.   Stiff bristle brushes (non-metallic)

    D.   Metal scraper


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    NOTE:  TEST CLEAN A SMALL AREA BEFORE ATTEMPTING TO CLEAN
    LARGE AREAS.

    A.   Removing Glue and Tar Stains:

         1.   Remove thick layers of glue and tar from the
              surface with a scraper that will not damage the masonry.

         2.   So some test samples following the manufacturer's directions;
              evaluate the effectiveness of the treatment and proceed with the chosen treatment as                    directed by manufacturer.

        3.   Water wash the surface with a sufficient pressure spray to
              remove all loose dirt and chemical remover.  Rinse
              thoroughly and allow to dry.

         4.   Repeat the process as necessary to achieve the
              desired level of cleanliness.

                         END OF SECTION