Conserving Decorative Painting On Plaster

Procedure code:
990001S
Source:
National Capitol Region Specifications
Division:
Finishes
Section:
Painting
Last Modified:
07/04/2016

CONSERVING DECORATIVE PAINTING ON PLASTER

PART 1---GENERAL

1.01 SUMMARY

    A. This procedure includes guidance on cleaning and conserving decorative painting on existing plaster surfaces.

    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 SUBMITTALS

    A.   Product Data: Submit manufacturer's product specifications and installation instructions for each material, including other data as may be required to show compliance with these specifications.

    B.   Operation and Maintenance Data: Submit written program for each phase of restoration process including protection of surrounding materials on building during operations. Describe in detail materials, methods and equipment to be used for each phase of restoration work.

1.03 QUALITY ASSURANCE

    A.   Field Samples: Prior to start of plaster work, prepare the following sample panels in building where directed by RHPO. Obtain RHPO's acceptance of visual qualities before proceeding with the work. Retain acceptable panels in undisturbed condition, suitably marked, during construction as a standard for judging completed work.

         1.   Decorative Painting Conservation: Demonstrate materials and methods to be used for cleaning and conserving of each type of decorative painting on plaster surfaces on sample areas of a 9 sq. ft. area.

1.04 PROJECT/SITE CONDITIONS

    A.   Environmental Requirements:

         1.   Monitor environmental conditioning throughout construction period. Notify owner if environmental conditions vary beyond minimum or maximum allowable conditions.

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

    B.   Existing Conditions: Protect surrounding surfaces from damage resulting from chemical cleaning and paint stripping work.

PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Liquidtex, Inc.

11 Constitution Avenue

Piscataway, NJ 08855  

888-422-7954

www.liquidtex.com
 

2.02 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 adequate for stain removal work, and these products should be purchased when available, as they tend to be less expensive.  Common names are indicated below by an asterisk (*).

    A.   Protective Coating for Decorative Painting: Varnish designed specifically for finishing decorative paintings, such as "Soluvar" (Liquidtex, Inc.), or approved equal.

         1.   Use a finish to match existing.

         2.   Thin varnish with paint thinner - one part varnish to three parts thinner.

    B.   Glaze Remover: 5 parts denatured alcohol, 3 parts paint thinner (such as mineral spirits or turpentine) and 1 part acetone. Denatured Alcohol:


         1.   Other chemical or common names include Methylated spirit*.

         2.   Potential hazards:  TOXIC AND FLAMMABLE.

         3.   Available from hardware store, paint store or printer's supply distributor.

         4.   Denatured alcohol should be a satisfactory substitute for ethyl alcohol for stain removing purposes.

         Mineral Spirits:

         1.   A petroleum distillate that is used especially as a  paint or varnish thinner.

         2.   Other chemical or common names include Benzine* (not Benzene); Naphtha*; Petroleum spirits*; Solvent naphtha*.

         3.   Potential Hazards:  TOXIC AND FLAMMABLE.

         4.   Safety Precautions:

              a.   AVOID REPEATED OR PROLONGED SKIN CONTACT.

              b.   ALWAYS wear rubber gloves when handling mineral spirits.

              c.   If any chemical is splashed onto the skin, wash immediately with soap and water.

         5.   Available from construction specialties distributor, hardware store, paint store, or printer's supply distributor.

         Turpentine:

         1.   Typically used as a solvent and thinner.

         2.   Potential Hazards:  TOXIC AND FLAMMABLE.

         3.   Safety Precautions:

              a.   Work in a well ventilated area.  

              b.   Observe safety rules as turpentine is flammable, and the fumes can trip an ionization smoke detection system.  

              c.   Store soiled cloths in a metal safety container to guard against spontaneous combustion.

              d.   Available from hardware store or paint store.

         Acetone(C3H6O):

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

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

         3.   Potential Hazards:  VOLATILE AND FLAMMABLE SOLVENT

         4.   Available from chemical supply house or hardware store.

    C.   Clean, soft cotton balls

    D.   Artist's paint to match existing

2.02 EQUIPMENT

    A.   Paint brushes (artist type)

PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   At locations indicated, clean and conserve existing decorative painting on existing plaster surfaces.

    B.   Saturate a rolled cotton ball with glaze remover and squeeze out excess.

    C.   Apply saturated cotton ball to surface and gently rub in a circular motion to remove glaze and accumulated dirt. Replace cotton ball frequently.


    D.   Continue rubbing as required to produce effect established by mock-up in a uniform manner over entire surface.

    E.   Paint-in damaged or missing portions of decorative  painting with artist's paints to match existing.

    F.   Apply two coats of protective coating to surface to comply with manufacturer's instructions.

3.02 ADJUSTING/CLEANING

    A.   Upon completion of this work, all floors, walls, and other adjacent surfaces that are stained, marred, or otherwise damaged by work under this section shall be cleaned and repaired and the adjacent areas shall be left  in clean and perfect condition.

    B.   All completed work shall be adequately protected from damage by subsequent building operations and effects of weather. Protection shall be by methods recommended by the manufacturer of installed materials and as approved by the RHPO.

END OF SECTION

Last Reviewed 2016-07-04