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Historic Preservation - Technical Procedures

Spectitle:

Removing Shellac From Wood Features And Refinishing

Procedure code:

0640012R

Source:

National Capitol Region Specifications

Division:

Wood And Plastics

Section:

Architectural Woodwork

Last Modified:

02/24/2012

Details:

Removing Shellac From Wood Features And Refinishing



REMOVING SHELLAC FROM WOOD FEATURES AND REFINISHING


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing shellac from
         wood features and refinishing with shellac and paste wax.

    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).


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Shellac

    B.   Denatured alcohol

    C.   Paste wax:  Proprietary or job-mixed compound containing
         carnuba, beeswax, cadelilla, or ceresin mixed with
         turpentine.

    D.   Wood filler, tinted to match wood

    E.   Steel wool, fine 00-0000

    F.   Sandpaper:  Extra fine grit

    G.   Clean, soft cloths

2.02 EQUIPMENT

    A.   Stiff, natural bristle brushes


PART 3---EXECUTION

3.01 PREPARATION

    A.   Surface Preparation:  

         1.   Mask all adjacent surfaces and protect other
              exposed surfaces in the work area.

         2.   Fill any splits in existing wood and sand smooth
              prior to sealer application.

3.02 ERECTION, INSTALLATION, APPLICATION

    NOTE:  Follow manufacturer's application instructions.  Final
    appearance of wood work must be uniform in all respects.

    A.   Select an inconspicuous area on which to test materials
         and application for each method type required.  Test area
         must be approved by the Contracting Officer.
   

    B.   After each test area has been prepared, receive approval
         from the Contracting Officer before commencing general
         application.

    C.   Coat wood with denatured alcohol.  Apply with soft cloth.
         Scrape up residue as quickly as possible.  Repeat
         application of alcohol until all shellac is removed.

    D.   Sand smooth.

    E.   Apply one coat of shellac with soft cloth and allow to
         dry.

    F.   Apply mixture of shellac and alcohol with soft cloth and
         allow to dry overnight.

    G.   Apply liberal amount of pastewax with soft cloth and
         allow to dry.

    H.   Buff wood lightly with steel wool.

    I.   Buff wood with soft brush.

    J.   Polish with soft cloth.

    K.   Other processes may be used as long as final results
         conform to quality standards and give uniform appearance.

                         END OF SECTION